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
In which year did ESI came into effect? 
Select and explain. 
A. 1948, B. 1958, C. 1960, D. 1975
A: 1948
Answer: A: 1948 
Explanation: The ESI Act was passed in 1948. It was amended in 1975, 1984 and 1989. It is an impoant measure of social security and occupational health in India. Ref: Park 21st edition page: 756.