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: Social & Preventive Medicine
Disability certificate is given for poor vision if visual acuity is 4/60, in tune of visual impairment as a percentage 
Select and explain. 
A. 1, B. 0.75, C. 0.3, D. 0.4
B: 0.75
Answer: B: 0.75 
Explanation: None