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Which hormone is known as the birth hormone and triggers the contraction of smooth muscles in the body?

1. Oxytocin
2. Vasopressin
3. Prolactin
4. Estrogen

Correct answer: Oxytocin

Solution

Oxytocin is known as the birth hormone because it stimulates the contraction of smooth muscles, especially in the uterus during childbirth. The other options do not perform this function.

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