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
Axial resolution in optical coherence tomography is about: 
Select and explain. 
A. 10 m, B. 30 m, C. 100 m, D. 300 m
A: 10 m
Answer: A: 10 m 
Explanation: Ans. 10 m