This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Under the National Programme for Control of Blindness, the goal is to reduce the prevalence of blindness to a level of - 
Select and explain. 
A. 0.10%, B. 0.31%, C. 0.50%, D. 1%
B: 0.31%
Answer: B: 0.31% 
Explanation: To reduce prevalence of blindness in population from 1.38% to 0.31% by 2000. Ref- Park&;s textbook of Preventive and social medicine 24th edition. .