Official Answer Key & Detailed Solution
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Correct Answer: Option (D) — Parathyroid
Concept & Option Breakdown
Standard Reference VerifiedThe secretion of parathyroid hormone (PTH) by the parathyroid glands is directly regulated by a negative feedback loop responding to serum calcium ion concentration, functioning completely independently of anterior pituitary tropic hormones.
Thyroid (controlled by TSH), Gonads (by LH/FSH), and Adrenals (by ACTH) all rely on pituitary tropic hormones, leaving Parathyroid.
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