This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, 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: - bitot's spots are triangular, pearly white or yellowish foamy spots on the bulbar conjunctiva on either side of cornea. - the prevalence of bitot's spots in population at risk more than 0.5 percent is regarded as a public health problem. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:616 <\p>