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': 'As the sample size increases standard deviation \nSelect and explain. \nA. Decreases, B. Increases, C. Remains the same, D. may increase or decrease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]