In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Ex Input:
Question: A flu vaccine was administered to residents in a large city and the vaccine was effective in lowering the risk of flu among the residents. This means that the lower risk of disease resulted in a 
 Answer: lower death rate.

Ex Output:
With better food and less chance of disease, the death rate fell.


Ex Input:
Question: As sound waves get shorter their frequency 
 Answer: increase

Ex Output:
As wavelength increases, frequency decreases.


Ex Input:
Question: If Milo's engine is running hot, how will adding oil affect friction? 
 Answer: reduce

Ex Output:

To reduce friction, oil is added to the engine.