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 : Jane Stafford (1899--1991) was an American medical writer and chemist. 
Question : What is the date of Jane Stafford's death?
date of death

Context : Narcissus in Chains is the tenth book in the Anita Blake: 
Question : What is the series that Narcissus in Chains is a part of?
series

Context : The Vision of Saint Eustace is a painting by the early Italian Renaissance master Pisanello, now in the National Gallery in London. 
Question : What is the name of the place where The Vision of Saint Eustace can be found?

collection