<prompt> Following is NOT a benefit of Randomization:Reduction of bias in selection of groupsEnsure comparability of both groupsFacilitates blinding of treatmentIncreases external validity of study  <response>: RANDOMISATION IN RCT causes: Reduction of selection bias Ensure comparability of both groups Ensure similar prognostic factors in both groups Facilitates blinding of treatment Increases Internal validity of study. Hence option-4 is answer. 