To determine which of these is not a steroid hormone, it is essential to recognize their classifications:
From this analysis, it is clear that Glucagon is not a steroid hormone. It is instead a peptide hormone, differing fundamentally in its structure and biosynthesis method from the other hormone options listed.
| 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 |