Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Antihistamines do not affect the secretion of acid in stomach. Reason R: Antiallergic and antacid drugs work on different receptors. In the light of the above statements, choose the correct answer from the options given below

Options

A. `A` is false but `R `is true
B. Both `A` and `R` are true and `R` is the correct explanation of `A`
C. ` A` is true but` R `is false
D. Both A and R are true but R is not the correct explanation of A

Answer

To solve the question regarding the Assertion A and Reason R, we will analyze both statements step by step.

### Step 1: Analyze the Assertion A
**Assertion A** states: "Antihistamines do not affect the secretion of acid in the stomach."

- Antihistamines are medications that block the action of histamine, a substance in the body that causes allergic symptoms.
- They are primarily used to treat allergies and do not have a direct role in the secretion of gastric acid.
- Therefore, the assertion is **correct**.

### Step 2: Analyze the Reason R
**Reason R** states: "Antiallergic and antacid drugs work on different receptors."

- Antiallergic drugs (like antihistamines) target histamine receptors (H1 receptors), while antacid drugs neutralize stomach acid and do not interact with histamine receptors.
- This indicates that these two classes of drugs operate through different mechanisms and receptors.
- Thus, the reason is also **correct**.

### Step 3: Relationship between Assertion and Reason
- The assertion is that antihistamines do not affect stomach acid secretion, and the reason explains that antihistamines and antacids work on different receptors.
- Since the reason provides a valid explanation for the assertion, we conclude that both the assertion and the reason are true, and the reason correctly explains the assertion.

### Conclusion
The correct answer is that both Assertion A and Reason R are true, and the reason is the correct explanation of the assertion.