Answer: Open-ended question
Explanation: An open-ended question refers to a question which requires an elaborate rather than static or one word answer or reply. Open-ended questions aren't suited by a Yes or No answer. Open-ended questions are employed in interviews or investigations in other to hear a person's narration, opinion, view or explanation on a certain topic or issue.
The question "What do you feel is the most important crime problem facing the police in your city today?" requires the interviewee to give his opinion on the criminal problem facing the police in a domain or area. ImA static, one word answer does not suit the kind of question.