CSF in brain is contributed by

Options

A. anterior choroid plexus
B. posterior choroid plexus
C. arachnoid layer
D. both (1) and (2)

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks about the contributors of cerebrospinal fluid (CSF) in the brain. CSF is a clear, colorless fluid that surrounds the brain and spinal cord, providing protection and nourishment.

2. **Identifying the Options:** The options provided include:
- A) Anterior choroid plexus
- B) Posterior choroid plexus
- C) Arachnoid layer
- D) Both A and B

3. **Analyzing Option A (Anterior Choroid Plexus):** The anterior choroid plexus is known to produce cerebrospinal fluid. This structure is located in the lateral ventricles of the brain and is made up of ependymal cells that facilitate the production of CSF.

4. **Analyzing Option B (Posterior Choroid Plexus):** The posterior choroid plexus also contributes to the production of cerebrospinal fluid. It is located in the fourth ventricle and works similarly to the anterior choroid plexus.

5. **Analyzing Option C (Arachnoid Layer):** The arachnoid layer is one of the three meninges that cover the brain and spinal cord. However, it does not produce cerebrospinal fluid; instead, it serves as a protective layer.

6. **Analyzing Option D (Both A and B):** Since both the anterior and posterior choroid plexuses contribute to the production of cerebrospinal fluid, this option is correct.

7. **Conclusion:** The correct answer to the question is option D, which states that both the anterior and posterior choroid plexuses contribute to the production of cerebrospinal fluid in the brain.

**Final Answer:** D) Both A and B

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