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Which one of the following pairs of organs includes only the endocrine glands?

1. Parathyroid and Adrenal
2. Pancreas and Parathyroid
3. Thymus and Testes
4. Adrenal and Ovary

Correct answer: Parathyroid and Adrenal

Solution

Parathyroid and adrenal are both endocrine glands: they release hormones directly into the bloodstream. The other pairs include organs with important non-endocrine roles, such as the pancreas (digestive enzymes) and testes/ovary (reproductive functions).

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