Optic nerve is the

Options

A. Fifth cranial nerves
B. Second crilnial nerve
C. Seventh cranial nerve
D. Ninth cranial nerve

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the optic nerve and its classification as a cranial nerve.

2. **Identifying the Options**: The options provided are:
- 5th cranial nerve
- 2nd cranial nerve
- 7th cranial nerve
- 9th cranial nerve

3. **Analyzing Each Option**:
- **5th Cranial Nerve**: This is known as the trigeminal nerve, which is primarily responsible for sensation in the face and motor functions such as biting and chewing. Therefore, this option is incorrect.
- **2nd Cranial Nerve**: This is the optic nerve, which is responsible for vision. This option is correct.
- **7th Cranial Nerve**: This is known as the facial nerve, which controls the muscles of facial expression. Thus, this option is incorrect.
- **9th Cranial Nerve**: This is the glossopharyngeal nerve, which is involved in swallowing and the gag reflex. Hence, this option is also incorrect.

4. **Conclusion**: The correct answer is the 2nd cranial nerve, which is the optic nerve.

**Final Answer**: The optic nerve is the 2nd cranial nerve.

---