This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Randomization is done to reduce- 
Select and explain. 
A. Recall bias, B. Selection bias, C. Berkosonian bias, D. Repoing bias
B: Selection bias
Answer: B: Selection bias 
Explanation: .randomization is a statisticaal procedure in which the paicipants are allocated to groups usually called study and control gropus.randomization is an approach to ensure comparability by the elimination of bias.randomisaton is the hea of a control trial.it ensures that the investigator has no control over the allocation of paicipants to groups.thus eliminating what is known as "SELECTION BIAS". ref:park&;s textbook,22 nd ed,pg 70