Definition: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : SpaceFM was originally developed from a fork of the legacy PCMan File Manager and later PCManFM-Mod. The internal virtual filesystem (VFS), was retained and extended.
Answer : PCMan File Manager
Output:
The SpaceFM is based upon what?