A : Linolenic acid is an essential fattly acid.
R : Linolenic acid cannot be synthesised in human beings.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statements but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Linolenic acid is an essential fatty acid."
- Essential fatty acids are those that cannot be synthesized by the body and must be obtained through diet.

2. **Understanding the Reason**:
- The reason states that "Linolenic acid cannot be synthesized in human beings."
- This means that humans must obtain linolenic acid from food sources, confirming its status as an essential fatty acid.

3. **Evaluating the Truth of the Assertion**:
- Linolenic acid is indeed classified as an essential fatty acid. This classification is based on the fact that it is necessary for human health but cannot be produced by the body.

4. **Evaluating the Truth of the Reason**:
- The reason is also true because linolenic acid is not synthesized in the human body, necessitating its intake through dietary sources.

5. **Conclusion**:
- Both the assertion and the reason are true. Furthermore, the reason provides a correct explanation for the assertion, as it clarifies why linolenic acid is considered essential.

6. **Final Answer**:
- Therefore, the correct answer is that both the assertion and the reason are true, and the reason is the correct explanation of the assertion.