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
Minimum visual acuity below which a person is called Blind 
Select and explain. 
A. Jan-60, B. Mar-60, C. Feb-60, D. Apr-60
B: Mar-60
Answer: B: Mar-60 
Explanation: According to WHO, minimum visual acuity below which a person is called Blind is 3/60.