A is not correct but R is correct.
To solve this question, we need to evaluate both the Assertion A and the Reason R related to the human menstrual cycle, and understand their relationship.
Conclusion: Both the Assertion and the Reason are correct, and the Reason provided is the correct explanation of the Assertion. Thus, the most appropriate answer is: Both A and R are correct and R is the correct explanation of A.
| Pair of skeletal parts | Category | |
|---|---|---|
| (a)$\,\,$ | Sternum and ribs$\,\,$ | Axial skeleton |
| (b)$\,\,$ | Clavicle and glenoid cavity$\,\,$ | Pelvic girdle |
| (c)$\,\,$ | Flumerus and ulna$\,\,$ | Appendicular skeleton |
| (d)$\,\,$ | Malleus and stapes$\,\,$ | Ear ossicles |