Read the assertion and reason carefully to mark the correct option out of the option given below:
Assertion: Blood sugar level falls rapidly after heptactomy.
Reason: The glycogen of the liver in the principal source of blood sugar

Options

A. Statement A. and B correct with B being reason for A
B. Statement A is correct but B is wrong
C. Statement A is correct but B is wrong
D. Both correct but B is not reason of A

Answer

To solve the assertion and reason question, we will analyze both the assertion and the reason step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- The assertion states: "Blood sugar level falls rapidly after heptactomy."
- Heptactomy refers to the surgical removal of a part or the entire liver. The liver plays a crucial role in regulating blood sugar levels by storing glycogen and converting it to glucose when needed.

2. **Understanding the Reason:**
- The reason states: "The glycogen of the liver is the principal source of blood sugar."
- Glycogen is a stored form of glucose in the liver. When blood sugar levels drop, the liver converts glycogen back into glucose through a process called glycogenolysis, releasing it into the bloodstream to maintain normal blood sugar levels.

3. **Analyzing the Relationship:**
- After heptactomy, the liver's ability to store glycogen and convert it to glucose is compromised. This leads to a rapid decrease in blood sugar levels because the primary source of glucose (glycogen in the liver) is reduced or removed.

4. **Conclusion:**
- Both the assertion and the reason are correct. The assertion accurately describes the effect of heptactomy on blood sugar levels, and the reason correctly identifies the role of liver glycogen as the principal source of blood sugar.

5. **Final Answer:**
- Therefore, the correct answer is that both the assertion and the reason are true, and the reason correctly explains the assertion.