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
Stratified sampling is ideal for 
Select and explain. 
A. Hetergenous data, B. Homogenous data, C. Both, D. None
A: Hetergenous data
Answer: A: Hetergenous data 
Explanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed