What was the question for this implicit rationale, and corresponding answer?
Investigation is an official examination of the facts about a situation, crime, etc. Police are likely to have the investigation part in a killing.
 The answer: investigation

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The question: What part are the police likely to have in a killing?
Options:
- gun
- pleasure
- investigation
- dies
- punishment