Final answer:
The organs related to reproduction are spermatogonium.
Step-by-step explanation:
The organs from the given list that are related to reproduction are:
a) Skin: The skin is not a reproductive organ.
b) Kidney: The kidney is not a reproductive organ.
c) Spermatogonium: Spermatogonium is a type of germ cell that gives rise to spermatozoa during spermatogenesis, which is the process of sperm production in males.