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
WHO definition of blindness in addition to visual acuity of less than 3/60 (Snellen's) also includes a visual field in the better eye equal to or less than: 
Select and explain. 
A. 5deg, B. 10deg, C. 15deg, D. 3deg
A: 5deg
Answer: A: 5deg 
Explanation: Ans. 5deg