This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Census, SRS, NFHS, DLHS, VRS, Subject name: Social & Preventive Medicine
[{'content': 'At what point in time is the population assessed for calculation of Crude death rate? \nSelect and explain. \nA. 1st Jan, B. 1st May, C. 1st July, D. 31st Dec', 'role': 'user'}, {'content': "Answer: C \nExplanation: For calculation of crude death rate,mid-year population is assesed. Population count as on 1st July of an year is considered as Mid Year Population of that year. Crude bih rate (CBR): Annual number of live bihs per 1000 mid-year population Crude death rate (CDR): Annual number of deaths per 1000 mid-year population 1st july also celebrated as doctor's day Findings of SRS Bulletin: 1. Crude Bih Rate (CBR): 20.2 per 1000 mid-year population 2. Crude Death Rate (CDR): 6.3 per 1000 mid-year population", 'role': 'assistant'}]