This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Midyear population is considered as that on \nSelect and explain. \nA. 1st June, B. 30th June, C. 1st July, D. 15th July', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The mid-year population is used to calculate bih and death rates. The mid-point refers to the population estimated as on first of July of a year.Park 23e pg: 55', 'role': 'assistant'}]