Which of the following statement regarding forebrain in correct?

Options

A. Forebrain consists of hypothalamus, thalamus and cerebellium
B. The layer of cells covering the cerebral hemispheres is referred to as white matter.
C. The lobe involved in regulation of sexual behaviour and expression of emotional reaction is also a part of the forebrain.
D. Association areas of the forebrain are sensory in function

Answer

To solve the question regarding which statement about the forebrain is correct, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Forebrain**:
- The forebrain is a major part of the brain that includes structures such as the cerebrum, thalamus, hypothalamus, and limbic system. It plays a crucial role in various functions including sensory processing, emotional regulation, and higher cognitive functions.

**Hint**: Remember that the forebrain includes the cerebrum, thalamus, hypothalamus, and limbic system.

2. **Evaluating the First Statement**:
- The first statement claims that the forebrain consists of the hypothalamus, thalamus, and cerebellum.
- This statement is incorrect because the cerebellum is not part of the forebrain; it is part of the hindbrain.

**Hint**: Distinguish between parts of the brain: cerebellum is not in the forebrain.

3. **Evaluating the Second Statement**:
- The second statement refers to the layer of cells covering the cerebral hemisphere as the white matter.
- This statement is also incorrect because the outer layer of the cerebral hemispheres is known as the grey matter, while the inner layer is referred to as white matter.

**Hint**: Remember the difference between grey matter (outer layer) and white matter (inner layer) in the brain.

4. **Evaluating the Third Statement**:
- The third statement discusses the lobe involved in the regulation of sexual behavior and emotional reactions, stating that it is part of the forebrain.
- This statement is correct. The temporal lobe, which is part of the forebrain, is indeed involved in these functions.

**Hint**: The temporal lobe is key in emotional regulation and sexual behavior.

5. **Evaluating the Fourth Statement**:
- The fourth statement claims that the association areas of the forebrain are sensory in function.
- This statement is incorrect because the association areas are responsible for integrating sensory information rather than being purely sensory.

**Hint**: Association areas integrate information, they are not limited to sensory functions.

### Conclusion:
After evaluating all the statements, the correct answer is the third statement regarding the temporal lobe's involvement in the regulation of sexual behavior and emotional reactions.

**Final Answer**: The correct statement regarding the forebrain is the third option.