Classify the relation of question with context to one of these categories: 1) award received, 2) based on, collection, 3) conflict, 4) constellation, 5) convicted of, 6) date of death, 7) director, 8) drafted by, 9) educated at, 10) medical condition, 11) military branch, 12) narrative location, 13) occupation, 14) original network, 15) parent company, 16) point in time, 17) production company, 18) residence, 19) series, 20) service entry, 21) sex or gender, 22) spouse, 23) standards body question.
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Question: Context : What later became known as the Whirlpool Galaxy was discovered on October 13, 1773 by Charles Messier while hunting for objects that could confuse comet hunters, and was designated in Messier's catalogue as M51. 
Question : The star Whirlpool Galaxy is part of the constellation known as what?

Answer: constellation


Question: Context : Oliver Otis Howard (November 8, 1830 -- October 26, 1909) was a career United States Army officer and a Union general in the American Civil War. 
Question : In which war/battle did Oliver Otis Howard fight?

Answer: conflict


Question: Context : Salt Water Tabby was scored by Scott Bradley, produced by Fred Quimby, and directed and written by William Hanna and Joseph Barbera. 
Question : What is the series called that Salt Water Tabby belongs to?

Answer:
series