This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
[{'content': 'True about Standard Deviation Curve \nSelect and explain. \nA. Mean = Median, B. Mean = 2 X Median, C. Median = variance, D. Standard deviation = 2 variance', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Mean = Median# STANDARD DEVIATION:> The standard deviation is the most frequently used measure of deviation. In simple terms, it is defined as \'Root -Means - Square- Deviation\'.> SD is the "average" degree to which scores deviate from the mean.> More precisely, you measure how far all your measurements are from the mean, square each one, and add them all up. The result is called the variance.> Take the square root of the variance, and you have the standard deviation.', 'role': 'assistant'}]