This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social science, Mental health & Genetics, Subject name: Social & Preventive Medicine
[{'content': 'Stage of contraction of family stas at - \nSelect and explain. \nA. Marriage, B. Bih of fis child, C. Bih of last child, D. Leaving home of first child', 'role': 'user'}, {'content': "Answer: D \nExplanation: -family is a group of biologically related individuals living together and eating from a common kitchen. - the stage of contraction of family begins when the first child leaves the home and ends when the last child leaves the home of parents. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:683 <\\p>", 'role': 'assistant'}]