Correct option is D
The correct answer is (d).
Introduction
Oligodendrocytes produce myelin (IV); Microglia are phagocytic (III); Astrocytes contribute to the blood‑brain barrier (I); Ependymal cells line the ventricles (II). Thus A‑IV, B‑III, C‑I, D‑II.
Information Booster
- Oligodendrocytes: CNS myelin.
- Microglia: immune defense.
- Astrocytes: maintain BBB and support.
- Ependyma: cerebrospinal fluid circulation.
- Option A misplaces microglia and astrocytes.
- Option B misplaces oligodendrocytes and microglia.
- Option C misplaces all.
Microglia are the resident macrophages of the brain and are involved in neuroinflammation.