Question

select the word that means the cause of a problem. epidemiologists are public health workers who investigate patterns of disease. when faced with a sudden outbreak of illness, epidemiologists study the situation to identify the culprit. it might be bacteria in food, a virus spread by insects, or dirty, contaminated water supplies. working quickly to solve the mystery, epidemiologists can save many lives.

Explanation:

The text states epidemiologists identify the "culprit" behind disease outbreaks, with examples like contaminated food/water or viruses—all causes of the illness problem. This matches the definition of "the cause of a problem".

Answer:

culprit