instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
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. 
Question : To which branch did 18th Mounted Brigade belong?
answer:
British Army


question:
Context : OPML (Outline Processor Markup Language) is an XML format for outlines (defined as ``a tree, where each node contains a set of named attributes with string values''). 
Question : Which is the basis of OPML?
answer:
XML


question:
Context : Hall Ridge (70°42′S 63°12′W) is a low, snow-covered ridge 5 nautical miles (9 km) south of the Eland Mountains in Palmer Land, Antarctica. 
Question : The continent of Hall Ridge is what?
answer:

Antarctica