This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health programmes in India, Subject name: Social & Preventive Medicine
Number of center of excellence in vision 2020- 
Select and explain. 
A. 20, B. 200, C. 2000, D. 20000
A: 20
Answer: A: 20 
Explanation: 20 Centre of excellence in vision 2020 Functions are Professional leadership Strategy development CME Laying of standards and quality assurance Research Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 440