What problem is shared by the placebo, control method, and the withdrawal design method?

Question

Quizplus · Accepted Answer

All three methods involve withholding or removing a treatment or intervention, which can raise ethical concerns about denying people potentially beneficial care. This is especially relevant when conducting research on vulnerable populations or severe illnesses where withholding treatment could be harmful. The ethical ramifications of this issue must be carefully considered and addressed in the design and implementation of these methods.

What Problem Is Shared by the Placebo, Control Method, and the Withdrawal