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 is observed every year on 
Select and explain. 
A. 11-Jan, B. April 7, C. 5-Jun, D. 1-Dec
B: April 7
Answer: B: April 7 
Explanation: None