Calcitonin is a thyroid hormone which

(A)elevates calcium level in blood
(B)has no effect on calcium
(C)elevates potassium level in blood
(D)lowers calcium level in blood.

The NCERT line that answers it

Verbatim line

Another thyroid hormone, i.e., thyrocalcitonin regulates calcium levels in our blood by decreasing it.

Chapter: Chemical Coordination and Integration
Section: intro Column II
Page: 11
Words matched: 14 of 14

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=0.8082, combined=0.8849). Verified: high — The span explicitly states 'thyrocalcitonin regulates calcium levels in our blood by decreasing it,' which directly and conclusively proves that calcitonin lowers calcium levels in blood, matching option D.

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Question text is reproduced from the published NEET 1998 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.