Q: Fact 1: Testosterone stimulates the reproductive organs to develop into male organs. Fact 2: Testicles are male reproductive organs. Given the two facts above, what hormone stimulates the development of testicles?

OPTIONS: [i] oestrogen; [ii] progesterone; [iii] positive; [iv] Testosterone; [v] FSH; [vi] stamina; [vii] sweating; [viii] epidermal;
A:
[iv]