instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Toxins is contained in the skin of brightly colored poison dart frogs.
answer:
What is contained in the skin of brightly colored poison dart frogs?


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:
Some viruses carry a few viral enzyme molecules within their capsids.
answer:
Some viruses carry a few viral enzyme molecules within their what?