You will be given a definition of a task first, then some input of the task.
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.

Context : The commune of Arcueil was officially renamed Arcueil-Cachan in 1894, after the hamlet of Cachan located within the commune.
Answer : Cachan
Output:
What was replaced Arcueil?