Locomotion And Movement

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Osteoporosis is characterised by decreased bone mass and increased chance of fractures.

Reason (R) : Common cause of osteoporosis is increased levels of estrogen.

In the light of the above statements, choose the most appropriate answer from the options given below: