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': 'The simplest measure of moality? \nSelect and explain. \nA. Crude death rare, B. Case fatality rate, C. Propotional moality rate, D. Specific death rate', 'role': 'user'}, {'content': "Answer: A \nExplanation: ref: Park's 23rd edition pg 57 It is the number of deaths (from all causes) per 1000 estimated mid-year population in one year, in a given place.", 'role': 'assistant'}]