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': 'In a city of 10000, Males : Females are 1 : 1. Sex ratio is:- \nSelect and explain. \nA. 1, B. 50, C. 5000, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sex Ratio = Females/ Males X 1000 1x/1x X1000 = 1000', 'role': 'assistant'}]