Participants in a clinical trial might report different symptoms when they know they are part of the intervention group instead of the control group.To avoid that,researchers use the following:

A) Confounding
B) Randomization
C) Concealment of random allocation
D) Masking
E) Effect modifiers

Concealment of Random Allocation

A technique used in randomized controlled trials to prevent selection bias by concealing the allocation sequence from those assigning participants to intervention groups.

Intervention Group

A group in a scientific study that receives the treatment or intervention being tested, as opposed to a control group which does not.

Control Group

A group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.