You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You have to predict the type of conversation sentence given as input. Your predictions can be one among: 'information' if the input statement states a piece of information, 'question' if the input statement asks for some information, 'directive' if the input sentence involves the management or guidance of operations, and 'commissive' when it constitutes a statement that commits the speaker to some future action.

What for ?
Solution: question
Why? The input sentence is a question asking the reason. Therefore this is a sentence classified as the question.

New input:  Ah . 
Solution:
commissive