Assertion (A): Enough calcium in the diet helps prevent osteoporosis.
Reason (R): Calcium is found in milk.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Both Assertion (A) and Reason (R) are correct, but R is not the correct explanation of A.
In an Assertion-Reason question, each statement is checked for truth first, and then R is tested as the cause of what A describes.
Assertion — correct. Osteoporosis is a weakening of the bones; calcium keeps bones strong, so enough of it helps prevent the disease.
Reason — correct. Milk is a rich source of calcium.
R only names where calcium is found. It does not say why calcium protects the bones, so R does not explain A.