Answer :
Placebo Effect
Explanation:
- Control group is Right Answer.
- An animal study is being conducted to determine the effect of vitamin C on the incidence of common cold.
- The researcher gives one group of rats the vitamin C pills and the other group of rats gets the ""dummy"" pill (placebo).
- The rats that received the placebo would be called the control group.
- Endogenous opioids, for example, endorphins and enkephalins, are normal pain alleviating synthetic substances created in the body.
- Absense of pain because of the misleading impact is reliant upon the actuation of propositions endogenous opioids in the brain.