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
In a community of 3000 people, 80% are Hindus 10% muslims, 5% 
Select and explain. 
A. Simple random, B. Stratified random, C. Systematic random, D. Inverse sampling
B: Stratified random
Answer: B: Stratified random 
Explanation: .