This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'The standard normal distribution is \nSelect and explain. \nA. Asymmetrical, B. Has mean = 1.0, C. Has variance = 0.0, D. Mean = median = mode', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Normal distribution :\n\nIs Bilaterally symmetrical.\nMean = median = mode.', 'role': 'assistant'}]