Osteoporosis, an age-related disease of skeletal system, may occur due to

(A)immune disorder affecting neuromuscular junction leading to fatigue
(B)high concentration of Ca++ and Na+
(C)decreased level of estrogen
(D)accumulation of uric acid leading to inflammation of joints

The NCERT line that answers it

Verbatim line

**Osteoporosis:** Age-related disorder characterised by decreased bone mass and increased chances of fractures.

Chapter: Locomotion and Movement
Section: 17.5 Disorders of Muscular and Skeletal System
Page: 10
Words matched: 21 of 21

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

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Decreased levels of estrogen is a common cause' of osteoporosis, which directly matches option C and distinguishes it from the other options.

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Question text is reproduced from the published NEET 2016 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.