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 Q]: Context : Lisa Cross (born 4 April 1978) is a professional British female bodybuilder. 
Question : What gender class does Lisa Cross belong to?
[EX A]: sex or gender

[EX Q]: Context : Salt Water Tabby was scored by Scott Bradley, produced by Fred Quimby, and directed and written by William Hanna and Joseph Barbera. 
Question : What is the series called that Salt Water Tabby belongs to?
[EX A]: series

[EX Q]: Context : Siti Noerbaja was the first adaptation of Marah Roesli's 1922 novel Sitti Nurbaya. 
Question : Which is the basis of Siti Noerbaja?
[EX A]:
based on