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

Ex Input:
Cells have four cycles.

Ex Output:
How many cycles do cells have?


Ex Input:
Macroevolution happens when forces of evolution work over a long period of time.

Ex Output:
What happens when forces of evolution work over a long period of time?


Ex Input:
After infecting a host, some viruses enter the inactive state of latency.

Ex Output:

After infecting a host, what inactive state do some viruses enter?