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
Village health guide scheme was staed in ? 
Select and explain. 
A. 1974, B. 1977, C. 1986, D. 1989
B: 1977
Answer: B: 1977 
Explanation: Ans. is 'b' i.e., 1977