[Q]: The man took notice of the woman.
What is the cause?

[A]: He caught a whiff of her perfume.

[Q]: The child caught a life-threatening illness.
What is the cause?

[A]: She didn't get vaccinated.

[Q]: The friends' dinnertime conversation turned to politics.
What is the effect?

[A]: A debate erupted.

[Q]: I drank from the water fountain.
What is the cause?

[A]:
I was thirsty.