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.

Ex Input:
Context : Lakmé is an opera in three acts by Léo Delibes to a French libretto by Edmond Gondinet and Philippe Gille. 
Question : The Lakmé is based upon what?

Ex Output:
based on


Ex Input:
Context : Rothfuss wrote The Name of the Wind during his nine-year advance toward his B.S. in English. 
Question : The The Name of the Wind is part of a what series?

Ex Output:
series


Ex Input:
Context : Fritz X was a nickname used both by Allied and Luftwaffe personnel. 
Question : What year was Fritz X made?

Ex Output:

service entry