This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Regressiom between height and age follows y=a+bx.THe curve is \nSelect and explain. \nA. Hyperbola, B. Sigmoid, C. Straight line, D. Parabola', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed", 'role': 'assistant'}]