Fact 1: Testosterone stimulates the reproductive organs to develop into male organs.

Fact 2: Male mammals have a tube-like organ called the 'penis'.

Given the two facts above, answer the question "what does testosterone stimulate reproductive tissues to develop?" with the following options: 
- penis
 - PDAs
 - A drug.
 - offspring
 - ovaries
 - Man
 - CO 2
 - vagina


 

 penis        