Among the following, indentify the pair of antihistamine drugs

Options

A. Brompheniramine and Terfenadine
B. Iproniazid and Phenelzine
C. Chlordiazepoxide and Equanil
D. Veronal and Valium

Answer

To solve the question, we need to identify which pair of drugs listed are classified as antihistamines.

### Step-by-Step Solution:

1. **Understand Antihistamines**: Antihistamines are drugs that block the action of histamine, a substance in the body that causes allergic symptoms. They are commonly used to treat allergies, hay fever, and cold symptoms.

2. **Analyze the Options**: We have four options to consider:
- **Option A**: Bromphenidamine and delfenidine
- **Option B**: Iproniazid and phenelzine
- **Option C**: Chlorodiazepoxide and equinil
- **Option D**: Verunal and Valium

3. **Identify Antihistamines**:
- **Option A**: Bromphenidamine is indeed an antihistamine used to relieve allergy symptoms. Delfenidine is also an antihistamine.
- **Option B**: Iproniazid and phenelzine are monoamine oxidase inhibitors (MAOIs) and are used as antidepressants, not antihistamines.
- **Option C**: Chlorodiazepoxide is a benzodiazepine used for anxiety, and equinil is also a tranquilizer. Neither are antihistamines.
- **Option D**: Verunal (a brand name for a sedative) and Valium (a benzodiazepine) are also not antihistamines.

4. **Conclusion**: The only pair that consists of antihistamine drugs is **Option A**: Bromphenidamine and delfenidine.

### Final Answer:
The correct pair of antihistamine drugs is **A. Bromphenidamine and delfenidine**.

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