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': 'In a clinical trial, blood pressure was measured between in a group of patients before and after treatment, which of the following test will be suitable as at test of significance? \nSelect and explain. \nA. Paired t-test, B. Mann Whitney U test, C. Student test, D. ANOVA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Paired t-test', 'role': 'assistant'}]