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 : In cryptography, the IDEA NXT algorithm (previously known as FOX) is a block cipher designed by Pascal Junod and Serge Vaudenay of EPFL (Lausanne, Switzerland). 
Question : Which is the basis of IDEA NXT?
based on

Context : Love Is a Many Splendored Thing is an American daytime soap opera which aired on CBS from September 18, 1967 to March 23, 1973. 
Question : Which place does Love Is a Many Splendored Thing exist in?
narrative location

Context : Stella Katsoudas (born November 3, 1971) is a Greek-American pop and rock singer better known for stage names Stella Soleil and Sister Soleil as well as having been frontwoman for Dirty Little Rabbits. 
Question : What was Stella Soleil's career?

occupation