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: Pathology
In myocardial infarction, light microscopic changes are evident by - 
Select and explain. 
A. 1 hour, B. 1/2 hour, C. 6 hours, D. 24 hours
B: 1/2 hour
Answer: B: 1/2 hour 
Explanation: Ans. is 'b' i.e., 1/2 hour