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.

[Q]: 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?
[A]: constellation


[Q]: Context : HD 43848 is a 9th magnitude K-type subgiant star located approximately 123 light-years away in the constellation of Columba. 
Question : What is the name of the constellation which HD 43848 belongs?
[A]: constellation


[Q]: Context : The 7.62×54mmR is a rimmed rifle cartridge developed by the Russian Empire and introduced as a service cartridge in 1891. 
Question : What was the year that 7.62×54mmR entered service?
[A]:
service entry