Do placebos relieve pain just by relaxation? And what is the evidence? A. Yes. People who are already relaxed gain no benefits from placebos. B. Yes. Placebos are effective only for people who are...

Do placebos relieve pain just by relaxation? And what is the evidence?
A. Yes. People who are already relaxed gain no benefits from placebos.
B. Yes. Placebos are effective only for people who are high in neuroticism.
C. No. A placebo can relieve pain in one body part without affecting another.
D. No. People who take a placebo become even more nervous than before.