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': 'Mean bone density amongst two groups of 50 people each is compared with each other. The test of significance used would be - \nSelect and explain. \nA. Paired-t-test, B. Student t-test, C. Analysis of variance, D. Chi-Square test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]