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
Bitot's spot prevalence as public health problem – 
Select and explain. 
A. > 1%, B. > 2%, C. > 0.5%, D. None
C: > 0.5%
Answer: C: > 0.5% 
Explanation: None