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': 'The proportional mortality rate is - \nSelect and explain. \nA. Number of death due to a particular cause, B. Number of death during that year, C. Number of death in one month, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]