You will be given a definition of a task first, then some input of the task.
Given a scientific passage and an answer, generate a question for the given answer.

Passage: An acid-base reaction according to the Brnsted-Lowry definition is a transfer of a proton from one molecule or ion to another. When ammonia is dissolved in water, it undergoes the following reversible reaction. Answer: acid-base
Output:
What type of reaction is a transfer of a proton from one molecule or ion to another?