<prompt> In clinical trials, the major purpose of randomization is to:Reduce selection bias in allocation to treatmentFacilitate double blindingEnsure groups are comparable on the base line characteristicsHelp ensure the study subjects are representative of general population  <response>: Randomization is a statistical procedure by which the selection bias is reduced and thus the paicipants are allocated into study and control groups to proceed with comparability. By randomization, there is equal distribution of factors between the two groups and thus comparison is allowed. Although randomization makes the groups comparable, it does not ensure comparability. Also double blinding is not facilitated by randomization. Ref: Parks Textbook of Preventive and Social Medicine, 19th Edition, Pages 77-78 