The following poisons/drugs have been correctly paired with an appropriate antidote/specific measure: (Select one that does not apply)

Correct Answer: D

Rationale: Correct pairs are paracetamol-acetylcysteine (A), iron-desferrioxamine (B), codeine-naloxone (C), and methanol-ethanol (E). D is incorrect; organophosphates use atropine/pralidoxime, not dicobalt edetate (used for cyanide).

Correct Answer: B

Rationale: Methadone causes dependence (A), is often given as an elixir (C), depresses the cough centre (D), and is reversed by naloxone (E). B is incorrect as prescribing regulations vary by country and don’t universally require special licences only for registered addicts.

Correct Answer: D

Rationale: Opioid withdrawal includes yawning (A), rhinorrhoea (B), mydriasis (C), diarrhoea (D), and tremor (E), all part of the autonomic and neurological response to cessation.

Correct Answer: A

Rationale: Smoking induces CYP1A2, increasing metabolism of diazepam (A) and theophylline (E). Phenytoin (B), ethanol (C), and warfarin (D) are less consistently affected by smoking-induced metabolism.

Correct Answer: C

Rationale: Alcohol is linked to atrial fibrillation (A) and cardiomyopathy (C). Buerger’s disease (B) is more tied to smoking, and coronary artery disease (D) and peripheral vascular disease (E) have weaker direct alcohol associations.