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 a community of 5000 people, the crude birth rate is 30 per 1000 people. The number of pregnant females is? \nSelect and explain. \nA. 165, B. 150, C. 175, D. 200', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]