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
World Health Day of WHO is on 
Select and explain. 
A. 7 April, B. 10 April, C. 11 April, D. 15 April
A: 7 April
Answer: A: 7 April 
Explanation: None