Assertion :- STH helps in growth.
Reason:- STH promotes protein anabolism.

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 regarding the assertion and reason, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "STH helps in growth."
- STH refers to Somatotropin, which is also known as Growth Hormone (GH).
- It is produced by the anterior pituitary gland and plays a crucial role in growth and development.

**Hint:** Consider what STH (Somatotropin) is and its primary function in the body.

### Step 2: Analyze the Reason
The reason states: "STH promotes protein anabolism."
- Protein anabolism refers to the process of building proteins from amino acids, which is essential for growth and tissue repair.
- Somatotropin indeed promotes protein synthesis, which is vital for muscle growth and overall development.

**Hint:** Reflect on how protein synthesis relates to growth and the role of hormones in this process.

### Step 3: Determine the Relationship Between Assertion and Reason
Now, we need to evaluate whether the reason provided is a correct explanation of the assertion.
- Since STH (Somatotropin) promotes protein anabolism, and protein synthesis is crucial for growth, the reason does indeed explain why STH helps in growth.

**Hint:** Think about how the mechanisms of hormone action can explain the physiological effects observed.

### Step 4: Choose the Correct Option
Based on the analysis:
- Both the assertion and reason are true.
- The reason is the correct explanation of the assertion.

Thus, the correct answer is: **Both assertion and reason are true, and reason is the correct explanation of assertion.**

**Final Answer:** Option 1 is correct.