This section contains Assertion and Reason type questions each question has 4 choices (1)(2)(3) and (4) out of which only one is correct
Assertion: Sulfa drug contains sulfonamide group
Reason:Salvarsan is a sulfa drug

Options

A. Both A and R are correct ,R is the correct explanation of A
B. Both A and R are correct,R is not the correct explanation of A
C. A is correct ,R is incorrect
D. R is correct,A is incorrect

Answer

To solve the assertion and reason question, let's break it down step by step.

### Step 1: Analyze the Assertion
The assertion states that "Sulfa drug contains sulfonamide group."
- **Explanation**: Sulfa drugs, also known as sulfonamides, are a class of antibiotics that contain the sulfonamide functional group (SO2NH2). This statement is true.

### Step 2: Analyze the Reason
The reason states that "Salvarsan is a sulfa drug."
- **Explanation**: Salvarsan, also known as arsphenamine, is not a sulfa drug. It is an organoarsenic compound used to treat syphilis and does not contain the sulfonamide group. Therefore, this statement is false.

### Step 3: Determine the Relationship
- The assertion is true, and the reason is false. In assertion-reason questions, if the assertion is true and the reason is false, we can conclude that the correct answer is that the assertion is correct, but the reason is not.

### Conclusion
Based on the analysis:
- Assertion: True
- Reason: False
- Therefore, the correct choice is (3) - Assertion is true, Reason is false.

---