This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': "The relationship of mean height of two group of children is best studied by- \nSelect and explain. \nA. Student's test, B. Linear regression, C. Chi-square test, D. Test of propoions", 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]