This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Distribution, Skewed Distributions, Subject name: Social & Preventive Medicine
[{'content': 'The mean of the 25 plasma volumes is 12.5 litres. Standard detion is 0.25. Calculate Variance:- \nSelect and explain. \nA. 0.0625, B. 0.625, C. 6.25, D. 625', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Standard detion = square root of variance Variance = (S.D X S.D) - Given SD = 0.25 - Thus, Variance = 0.25 x 0.25 = 0.0625', 'role': 'assistant'}]