Write a correct answer for the question. You should reason about prototypical situations and provide the correct answer. Avoid answers that provide incomplete justification for the question.

Example Input: name something you'd hate to be without if you were climbing mt. everest.
Example Output: rope

Example Input: name something a church couldn't do without
Example Output: pastor

Example Input: name something a suspicious girlfriend may check in her boyfriend's cell phone
Example Output:
messages