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Which one of the following is employed as Antihistamine?

1. Chloramphenicol
2. Diphenylhydramine
3. Norethindrone
4. Omeprazole

Correct answer: Diphenylhydramine

Solution

Diphenylhydramine is an antihistamine used to treat allergies by blocking histamine receptors, while the other options serve different pharmacological purposes.

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