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Chronic poisoning of which of the following causes tactile hallucinations ?

  • A.Opium
  • B.Cannabis
  • C.Cocaine
  • D.Lysergic acid diethylamide

Answer: C

Tactile hallucinations are caused by chronic cocaine poisoning.

Chronic cocaine use produces the characteristic formication, the sensation of insects crawling under the skin, also called Magnan's symptom or cocaine bugs; users may scratch or dig at their skin to remove them.

Cannabis and LSD mainly cause visual and other perceptual distortions, and chronic opium use causes constipation, constricted pupils, emaciation and craving rather than tactile hallucinations.

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