instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
Context : Yu Hiu Tung (Chinese: 余曉東; pinyin: Yú Xiǎodōng; Jyutping: jyu4 hiu2 dung1; born 5 February 1984) is a professional tennis player from Hong Kong. 
Question : What city is Yu Hiu Tung from?
answer:
Hong Kong


question:
Context : Gustav Wachtmeister (25 July 1757 -- 20 July 1826) was a Swedish Army officer made famous at the Battle of Valkeala in Finland in 1789 against Russia where he was wounded by a musket shot to his arm, which had to be amputated. 
Question : In what war was Gustav Wachtmeister in?
answer:
Battle of Valkeala


question:
Context : Once Upon a Song (Chinese: 童話戀曲201314), is a 2015 musical drama television series produced by Hong Kong Television Network. 
Question : What studio produced Once Upon a Song?
answer:

Hong Kong Television Network