You are presented with the quiz "What swim from organs that produce hormones for fertilization?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sperm had to swim from male to female reproductive organs for fertilization" and "endocrinology is the study of organs that produce hormones involved in fertility and reproduction". 

So, what's the best answer to the question?


 

 sperm          