Assertion. Stimulus is interpreted by the brain and not by sense organs.
Reason. Sense organs act as transducers, transforming the stimulus energy into impulse energy.

Options

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

Answer

To analyze the given assertion and reason, we will break it down step by step.

### Step 1: Understanding the Assertion
The assertion states that "Stimulus is interpreted by the brain and not by sense organs."
- **Explanation**: This means that while sense organs detect stimuli (like light, sound, taste, etc.), they do not interpret what those stimuli mean. The interpretation of these signals occurs in the brain.

### Step 2: Understanding the Reason
The reason states that "Sense organs act as transducers, transforming the stimulus energy into impulse energy."
- **Explanation**: Sense organs (like eyes, ears, and skin) convert different forms of energy from stimuli (like light, sound waves, and pressure) into electrical impulses. These impulses are then sent to the brain for interpretation.

### Step 3: Evaluating the Truth of the Assertion
- The assertion is true because the brain is responsible for interpreting sensory information. Sense organs only detect stimuli and convert them into impulses.

### Step 4: Evaluating the Truth of the Reason
- The reason is also true. Sense organs do function as transducers, converting various forms of energy into electrical impulses that can be processed by the nervous system.

### Step 5: Relationship Between Assertion and Reason
- The reason explains how the assertion is true. Since sense organs do not interpret stimuli but convert them into impulses, it supports the assertion that interpretation occurs in the brain.

### Conclusion
Both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer
**Option A**: Both assertion and reason are true, and R is the correct explanation of A.

---