A randomized controlled experiment was performed to study the effectiveness of new medication for canker sores (a small, shallow sore inside the mouth or at the base of the gums.). The treatment group received the new medication and the control group received a placebo. The study was double-blinded. Some of the individuals in the control group experienced pain relief and speedy healing similar to the treatment group. Which of the following best describes this phenomenon? Confounding Prospective study Selection bias Simpson's paradox Placebo effect

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