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JEE Advanced levelSingle correct optionDifficulty 3 of 3el162

A patient with depression has low noradrenaline levels because an enzyme degrades it too fast. A drug that inhibits this enzyme is given. The drug is classified as and its target is

  1. Aa tranquilizer acting as a receptor antagonist for noradrenaline
  2. Ban antidepressant; the target is an enzyme
  3. Can antihistamine whose target is a receptor
  4. Dan antibiotic whose target is bacterial cell wall

Answer: B

Blocking the enzyme that breaks down noradrenaline raises its level and restores signalling, which is the action of antidepressants such as iproniazid and phenelzine. The target here is an enzyme, not a receptor, and the drug is not an antihistamine or antibiotic.
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