Answer :

The correct answer is:

B. Pineal gland

Explanation:
1. The pineal gland is a ductless gland, meaning it does not have ducts or tubes to transport its secretions. It releases hormones directly into the bloodstream.
2. The thymus and thyroid glands, on the other hand, have ducts and are not classified as ductless glands.
3. Therefore, only the pineal gland fits the description of being ductless among the options provided.

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