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

[EX Q]: In circles way do particles of water move in deep water.
[EX A]: In which way do particles of water move in deep water?

[EX Q]: Fungi is the major cause of disease in agricultural crops.
[EX A]: What is the major cause of disease in agricultural crops?

[EX Q]: Cigarettes are a major source of carcinogens, a kind of chemical substances linked with cancer.
[EX A]:
Cigarettes are a major source of what kind of chemical substances linked with cancer?