Answer: True- The placebo affect
Explanation:
Yes, the given answer is true based on the given statement is that the placebo effect is one of the phenomenon in which the people experiencing the various types of benefits for improving the response of the placebo effect.
According to the given question, Darien is a 3 years old child and his mother kisses his injured knee so magically his pain get disappeared.
This given phenomenon is known as the placebo effect in the psychology as it improve the condition of the patient as it is basically used by the researcher also for the purpose of understanding the different types of effects.
Therefore, The placebo affect is the correct answer.