Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: When an atom gains or loses an electron it becames a(n) ion.

Output: When an atom gains or loses an electron it becames an?


Input: Consider Input: Transparent matter transmits light without scattering it.

Output: What type of matter transmits light without scattering it?


Input: Consider Input: Producing sperm and secreting testosterone are the main functions of male reproductive system system.


Output: Producing sperm and secreting testosterone are the main functions of what system?