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.
Input: Context : The 18th Mounted Brigade previously known as the 2/1st Yorkshire Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War.
Answer : British Army
Output:
To which branch did 18th Mounted Brigade belong?