This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
The superior oblique muscle is supplied by - 
Select and explain. 
A. 3
rd 
cranial nerve, B. 4
th
 cranial nerve, C. 5
th
 cranial nerve, D. 6
th 
cranial nerve
B: 4
th
 cranial nerve
Answer: B: 4
th
 cranial nerve 
Explanation: Superior oblique is supplied by 4th (trochlear) nerve.