You Wake Up in the Middle of the Night with a Splitting

Multiple Choice

You wake up in the middle of the night with a splitting headache. Blearily, you stumble to the medicine cabinet and feel for the bottle of aspirin. Taking one, you return to bed, and you find that after 20 minutes of tossing and turning, your headache dissipates enough to enable you to sleep. When you wake up and look in the bathroom, you discover that you actually took a vitamin E pill instead of aspirin. You realize that your headache went away during the night due to the

A) biological properties of vitamin E.
B) placebo effect.
C) Barnum effect.
D) release of norepinephrenine accompanying the ingestion of vitamin E.