Which cranial nerves are sensory :

Options

A. 1,2,8
B. 3,4,6,11,12
C. 5,7,9,10
D. None of them

Answer

To determine which cranial nerves are sensory, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Cranial Nerves**: There are 12 pairs of cranial nerves, each with specific functions. We need to identify which of these are purely sensory.

2. **List the Cranial Nerves**:
- I: Olfactory
- II: Optic
- III: Oculomotor
- IV: Trochlear
- V: Trigeminal
- VI: Abducens
- VII: Facial
- VIII: Vestibulocochlear
- IX: Glossopharyngeal
- X: Vagus
- XI: Accessory
- XII: Hypoglossal

3. **Classify the Cranial Nerves**:
- **Sensory Nerves**: These nerves are responsible for carrying sensory information to the brain. The sensory cranial nerves are:
- I: Olfactory (smell)
- II: Optic (vision)
- VIII: Vestibulocochlear (hearing and balance)

4. **Examine the Options**:
- Option 1: 1, 2, 8 (Correct: Olfactory, Optic, Vestibulocochlear)
- Option 2: 3, 4, 6, 11, 12 (Incorrect: These are primarily motor nerves)
- Option 3: 5, 7, 9, 10 (Incorrect: These are mixed nerves with both sensory and motor functions)
- Option 4: None of them (Incorrect: There are sensory nerves)

5. **Conclusion**: The correct answer is Option 1, which includes the sensory cranial nerves: Olfactory (I), Optic (II), and Vestibulocochlear (VIII).

### Final Answer:
The cranial nerves that are sensory are:
- Olfactory (I)
- Optic (II)
- Vestibulocochlear (VIII)