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': 'The regression 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:Parks 23rd edition pg 853 y= a+bx : straight line. If we wish to know in an individual case, the value of one variable, knowing the value of the other we can calculate the regression coefficient of one measurement to another', 'role': 'assistant'}]