Detailed Instructions: 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.
Problem:Context : On that occasion, most of the commune of Montrouge was annexed to Paris, forming what is now called Petit-Montrouge, in the 14th arrondissement of Paris.
Answer : 14th arrondissement of Paris
Solution:
By what was Montrouge replaced?