Forensic Toxicology Practice Questions

Q: All are organophosphorus poisons, except.

Propoxur. ***Propoxur*** - **Propoxur** is a **carbamate insecticide**, not an organophosphorus compound. - Carbamates inhibit **acetylcholinesterase** reversibly, leading to similar cholinergic symptoms but with a generally shorter duration of action compared to organophosphates. - This is the primary answer as carbamates are the most commonly tested alternative to organophosphates. *Abate* - **Abate** (also known as **temephos**) is an **organophosphate insecticide**. - It is often used as a larvicide to control mosquito populations, particularly in water. - Contains phosphorus-based structure typical of organophosphate compounds. *Dibenanone* - **Dibenanone** is NOT a standard organophosphorus compound. - It is a **chlorinated hydrocarbon** or **organochlorine compound** used as an insecticide. - While this option is also technically not an organophosphate, **Propoxur (carbamate)** is the more classical answer as carbamates vs. organophosphates is a key distinction in toxicology. *Malathion* - **Malathion** is a well-known and widely used **organophosphate insecticide**. - It works by irreversibly inhibiting **acetylcholinesterase**, causing accumulation of acetylcholine at cholinergic synapses. - One of the most commonly encountered organophosphate compounds in forensic toxicology.

Q: What type of poison is DDT classified as?

Neurotoxic agent affecting the CNS. ***Neurotoxic agent affecting the CNS*** - **DDT** (dichlorodiphenyltrichloroethane) is classified in **Forensic Medicine** as a **neurotoxic poison** affecting the **central nervous system** - It belongs to the **organochlorine insecticide** group, which causes toxicity through **CNS hyperexcitability** - Clinical features of DDT poisoning include **tremors, convulsions, paresthesias, hyperexcitability**, and in severe cases, **seizures and respiratory failure** - Classification in forensic toxicology is based on the **target organ system affected in humans**, not its mechanism of action in insects *Contact poison affecting insects directly* - While this describes DDT's **entomological mechanism** (how it kills insects through contact), this is NOT the forensic medicine classification - In **Forensic Medicine and Toxicology**, poisons are classified based on their effects on **human organ systems** - The question asks for classification as a "type of poison," which in medical context refers to human toxicology, not agricultural/insecticidal properties *Ingested poison affecting the stomach* - DDT does not primarily cause **gastrointestinal toxicity** or act as a corrosive/irritant poison - Though it can be ingested, its main toxic effects are **neurological**, not gastric - Stomach poisons in forensic classification include corrosives and irritants, which DDT is not *Not a recognized type of poison* - This is clearly incorrect as DDT is a **well-established poison** with significant forensic and toxicological importance - It has been extensively studied due to historical widespread use and subsequent health concerns - DDT poisoning cases are documented in forensic literature with characteristic CNS manifestations

Q: What is the average fatal period of copper poisoning?

1-3 days. *30-60 minutes* - A fatal period of **30-60 minutes** is typically seen in very rapid and aggressive poisonings, such as with highly corrosive substances, which is not characteristic of **copper poisoning**. - While initial symptoms of copper poisoning can appear quickly, the progression to death usually takes longer due to the nature of the organ damage. *3-7 days* - A fatal period of **3-7 days** is possible in some cases, especially if complications evolve more slowly, but **1-3 days** is the more common average. - This longer period might be seen in less severe ingestions where organ failure progresses at a more gradual pace. *7-14 days* - A fatal period of **7-14 days** is generally too long for average **acute copper poisoning**; such prolonged periods are more typical of chronic or very extended critical illnesses. - While patients might remain critically ill for this duration, death from acute copper poisoning usually occurs earlier. ***1-3 days*** - The fatal period for **copper poisoning** generally ranges from **1 to 3 days**, reflecting the time it takes for systemic complications to become lethal. - This period allows for the development of severe symptoms such as **acute kidney injury**, **liver failure**, and **hemolysis**, which are the primary causes of death.

Q: Which of the following does not refer to a cannabis preparation?

Afeem. ***Afeem*** - **Afeem** is a preparation of **opium**, which is derived from the **opium poppy** (Papaver somniferum), not cannabis. - Opium contains **opiates** like morphine and codeine, which have different psychoactive and pharmacological effects than cannabis. *Charas* - **Charas** is a form of **hashish** made from the resin of the cannabis plant, primarily from Indian cannabis strains. - It involves hand-rubbing the live plant to collect the resin, which is then rolled into balls or sticks. *Reefer* - **Reefer** is a slang term for a **marijuana cigarette** or a **joint**. - It refers to dried cannabis flowers rolled in paper for smoking. *Sinsemilla* - **Sinsemilla** refers to **unpollinated female cannabis plants** that produce a higher concentration of tetrahydrocannabinol (THC). - The term literally means "without seeds" (from Spanish "sin semilla") and is prized for its potency.

Question 1

All are organophosphorus poisons, except.

Accepted Answer

Propoxur

Answer

Abate

Answer

Dibenanone

Answer

Malathion

Question 2

What type of poison is DDT classified as?

Accepted Answer

Neurotoxic agent affecting the CNS

Answer

Ingested poison affecting the stomach

Answer

Contact poison affecting insects directly

Answer

Not a recognized type of poison

Question 3

What is the average fatal period of copper poisoning?

Accepted Answer

1-3 days

Answer

30-60 minutes

Answer

3-7 days

Answer

7-14 days

Question 4

Which of the following does not refer to a cannabis preparation?

Accepted Answer

Afeem

Answer

Charas

Answer

Reefer

Answer

Sinsemilla

Forensic Toxicology — MCQs

Forensic Toxicology — MCQs

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