instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Producing sperm and secreting testosterone are the main functions of male reproductive system system.
answer:
Producing sperm and secreting testosterone are the main functions of what system?


question:
Solid is characterized by molecules with minimal movement and strong forces between them.
answer:
Which state of matter is characterized by molecules with minimal movement and strong forces between them?


question:
A microscope would best help a person observe the parts of a plant cell.
answer:
Which tool would best help a person observe the parts of a plant cell?