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
[{'content': 'In crude death rate, the population is taken as on \nSelect and explain. \nA. 1st March, B. 1st April, C. 15th August, D. 1st July', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The mid-year population is considered.\nHence July 1st is taken.', 'role': 'assistant'}]