Answer:
b. the placebo effect.
Step-by-step explanation:
Based on the information provided within the question it can be said that Mrs. Shyam's reaction best illustrates the placebo effect. This effect is a phenomenon where individuals seem to experience the effects of a treatment that has no real effects, solely because they believe it is something else. Which is what is happening since Mrs. Shyam believed the diagnostic test was a therapeutic treatment for her anxiety disorder even though it was not.