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.

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?
based on

Context : Æthelswith (c. 838-888) was the only known daughter of King Æthelwulf of Wessex. 
Question : What is Æthelswith's spouse's name?
spouse

Context : The Lawless Years is an American crime drama series that aired on NBC from April 16, 1959, to September 22, 1961. 
Question : Where network aired The Lawless Years?

original network