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': 'Area under standard normal distribution curve is \nSelect and explain. \nA. 1, B. 0.5, C. 5, D. 2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Standard normal distribution curve has :\n\nArea under the curve = 1.\nHas variance = 1.\nMean = median = mode.\nMean = 0\nStandard deviation = 1.', 'role': 'assistant'}]