Which of following is not a protein hormone?

Relaxin

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hCG

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Placental lactogen

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Estradiol

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Solution

The correct option is D Estradiol
Relaxin, hCG, and placental lactogen are protein hormones having amino acids bonded together in a polypeptide chain.
Estradiol is a steroid hormone and has three cyclohexyl rings and one cyclopentyl ring joined into a single structure.
Thus, the correct answer is D.

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