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Q: Drug causing marked extra pyramidal side effects
  • A. Olanzapine
  • B. Risperidone
  • C. Fluphenazine
  • D. Quetiapine
Correct Answer: Option C - Extrapyramidal symptoms are the most commonly caused by typical antipsychotic drugs that antagonize dopamine D₂ receptors. The most common typical antipsychotics associated with extrapyramidal side effects are haloperidol and Fluphenazine.
C. Extrapyramidal symptoms are the most commonly caused by typical antipsychotic drugs that antagonize dopamine D₂ receptors. The most common typical antipsychotics associated with extrapyramidal side effects are haloperidol and Fluphenazine.

Explanations:

Extrapyramidal symptoms are the most commonly caused by typical antipsychotic drugs that antagonize dopamine D₂ receptors. The most common typical antipsychotics associated with extrapyramidal side effects are haloperidol and Fluphenazine.