Question: __________, an odorous steroid that is well documented as a pheremone in pigs, has been isolated in the underarm sweat of humans.
A: Ephderine
B: Human Chorionic Gonadotropin (hCG)
C: Hyalunronidase
D: Androstenol
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.