Assertion : Proto-oncogenes are cellular genes required for normal growth.
Reason : Under normal conditions they could lead to the oncogenic tranformation of the cell.

Options

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

Explanation

To solve the question, we need to analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Proto-oncogenes are cellular genes required for normal growth."
- This statement is **true**. Proto-oncogenes are indeed normal cellular genes that play a crucial role in regulating cell growth and division.

2. **Understanding the Reason**:
- The reason states that "Under normal conditions they could lead to the oncogenic transformation of the cell."
- This statement is **false**. Under normal conditions, proto-oncogenes do not lead to oncogenic transformation. It is only under abnormal conditions (such as mutations or external factors like carcinogens) that proto-oncogenes can become oncogenes, which are associated with cancer.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the assertion is correct, but the reason does not correctly explain the assertion.

### Final Answer:
- **Assertion**: True
- **Reason**: False