TASK DEFINITION: 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.
PROBLEM: Context : Abell 754 is a galaxy cluster in the constellation Hydra that was formed from the collision of two smaller clusters. 
Question : Which was the constellation for Abell 754?

SOLUTION: constellation

PROBLEM: Context : TAROM Flight 371 was an Airbus A310 that crashed near Baloteşti in Romania on 31 March 1995. 
Question : When did TAROM Flight 371 occur?

SOLUTION: point in time

PROBLEM: Context : The next two historical stories, The Smugglers (which immediately follows The War Machines) and Season 4's The Highlanders, were to be the last purely historical stories until Season 19's Black Orchid. 
Question : Of what series is The War Machines a part of?

SOLUTION:
series