Assertion : Ranikhet disease is the disease of poultry.
Reason : It is caused by a virus.

Options

A. statement a is wrong and b is correct
B. both the statement a and b are wrong
C. both the statement a and b are correct
D. statement a is correct and b is wrong

Answer

To analyze the assertion and reason provided in the question, we can break down the solution into the following steps:

### Step 1: Understand the Assertion
The assertion states that "Ranikhet disease is a disease of poultry."
- Ranikhet disease, also known as Newcastle disease, is indeed a disease that primarily affects poultry, including chickens and other birds.

### Step 2: Evaluate the Reason
The reason given is "It is caused by a virus."
- Ranikhet disease is caused by the avian paramyxovirus type 1 (APMV-1), which confirms that it is indeed a viral disease.

### Step 3: Determine the Truth of Both Statements
Now that we have evaluated both the assertion and the reason:
- The assertion is correct because Ranikhet disease affects poultry.
- The reason is also correct because it is caused by a virus.

### Step 4: Conclusion
Since both the assertion and the reason are correct, we can conclude that the correct answer to the question is that both statements are correct.

### Final Answer
Both the assertion and reason are correct.

---