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': 'shape of normal distribution curve- \nSelect and explain. \nA. J shape, B. U shape, C. Bell shape, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref:Parks 23rd edition pg 849. Standard normal curve: It is a smooth, bell-shaped, perfectly symmetrical curve based on an infinitely large number of observations. The total area of the curve is 1 . Mean =0 Standard detion is 1 Mean, median and mode all coincide .', 'role': 'assistant'}]