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: Dental
[{'content': 'Measure of dispersion in normal distribution from mean is known as \nSelect and explain. \nA. Standard deviation, B. Range, C. Variance, D. Median', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]