Difficulty: Medium
Average Score: 67%
Simulated
A natural supplement that can enhance sleep for many people is:
Correct answer
D
Rationale
The correct answer is D: melatonin. Melatonin is a hormone that regulates sleep-wake cycles. It can be taken as a supplement to improve sleep quality and help with insomnia. Magnesium (A) can also aid in relaxation but is not as specific to sleep regulation as melatonin. Calcium (B) does not directly impact sleep. Oil of lavender (C) may have calming effects but is not as effective as melatonin for enhancing sleep.