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
The relationship of mean height of two group of children is best studied by- 
Select and explain. 
A. Student's test, B. Linear regression, C. Chi-square test, D. Test of propoions
A: Student's test
Answer: A: Student's test 
Explanation: .