This is what is referred to as clinical equipoise. The RCT as discussed above hence aims at disturbing the equipoise through the random trials to know which of the two or more interventions works the best among the identified population (Grady C., 2016)
Consent is often considered voluntary when the individual involved in the medical research and/or treatment is of sound mind, not a minor, is of good health, at least good enough for him to effectively debate and articulate his ideas and also question the procedure as explained by the doctor or the researchers. The voluntary consent also demands that the individual must be supplied with all the necessary information about the research and he should not be under any inducement or captivity or duress to participate in the medical research (Department of Health, Education, and Welfare, 1979)