Assertion : Cholecystokinin is released by duodenum.
Reason : It activates pepsinogen and bile juice.

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 assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

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

### Step 1: Analyze the Assertion
- **Assertion**: "Cholecystokinin is released by duodenum."
- **Explanation**: Cholecystokinin (CCK) is indeed a hormone that is secreted by the cells in the duodenum (the first part of the small intestine) in response to the presence of fats and proteins in the chyme. Therefore, this assertion is **true**.

### Step 2: Analyze the Reason
- **Reason**: "It activates pepsinogen and bile juice."
- **Explanation**: Cholecystokinin does stimulate the release of bile from the gallbladder and pancreatic enzymes, but it does not activate pepsinogen. Pepsinogen is activated to pepsin by hydrochloric acid in the stomach, not by cholecystokinin. Therefore, this reason is **false**.

### Step 3: Conclusion
- Since the assertion is true and the reason is false, the correct answer is: **Assertion is true but reason is false**.

### Final Answer
The correct option is: **Assertion is true but reason is false**.

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