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
The major purpose of randomization in a clinical trails is to - 
Select and explain. 
A. Facilitate double blinding, B. Help ensure the study subjects are representative of general population, C. Ensure the groups are comparable on base line characteristics, D. Reduce selection bias in allocation to treatment
D: Reduce selection bias in allocation to treatment
Answer: D: Reduce selection bias in allocation to treatment 
Explanation: None