📊 Biology
Q. Which hormone regulates sleep cycle?
  • (A) Melatonin
  • (B) Insulin
  • (C) Thyroxine
  • (D) Estrogen
✅ Correct Answer: (A) Melatonin

Explanation: Melatonin controls circadian rhythm.

Explanation by: Mr. Dubey
Melatonin controls circadian rhythm.

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