[Q]: The tenant misplaced his keys to his apartment.
What is the effect?

[A]: His landlord unlocked the door.

[Q]: The guests of the party hid behind the couch.
What is the cause?

[A]: It was a surprise party.

[Q]: The company's profits started to level off.
What is the effect?

[A]: It increased its marketing efforts for new products.

[Q]: The child became immune to the disease.
What is the cause?

[A]:
He received the vaccine for the disease.