Assertion : Tetracycline is a broad spectrum antibiotic.
Reason : Tetracyclin is effective against a number of types of bacteria, large viruses and typhus fever.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false
D. If the assertion and reason both are false

Explanation

To analyze the assertion and reason provided in the question, we will break down the statements and evaluate their validity step by step.

### Step 1: Understand the Assertion
The assertion states that "Tetracycline is a broad-spectrum antibiotic."
- **Explanation**: Broad-spectrum antibiotics are those that are effective against a wide variety of bacteria, both Gram-positive and Gram-negative. Tetracycline is indeed classified as a broad-spectrum antibiotic because it can target multiple types of bacteria.

### Step 2: Understand the Reason
The reason states that "Tetracycline is effective against a number of types of bacteria, large viruses, and typhus fever."
- **Explanation**: Tetracycline is primarily effective against various types of bacteria, including those that cause infections. However, it is important to note that tetracycline is not effective against viruses. It is not typically used to treat viral infections. While it is effective against certain bacterial infections, including those that cause typhus fever, the mention of "large viruses" is misleading because antibiotics do not work on viruses.

### Step 3: Evaluate the Relationship
Now we need to evaluate the relationship between the assertion and the reason.
- The assertion is true: Tetracycline is a broad-spectrum antibiotic.
- The reason is partially true: Tetracycline is effective against a number of types of bacteria and can treat typhus fever, but it is not effective against viruses.

### Conclusion
- The assertion is correct.
- The reason is incorrect as it inaccurately states that tetracycline is effective against large viruses.

### Final Answer
- The assertion is true, but the reason is false. Therefore, the correct conclusion is that while tetracycline is indeed a broad-spectrum antibiotic, the reason provided does not accurately explain this assertion.