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
Muscle which makes the angle of 51° to optical axis 
Select and explain. 
A. Superior rectus, B. Superior oblique, C. Inferior rectus, D. All the above
B: Superior oblique
Answer: B: Superior oblique 
Explanation: Obliques makes an angle of 51° to optical axis.