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.

Let me give you an example: Context : Isaac Nicola Romero (1916 in Havana, Cuba -- 1997) was a prominent Cuban guitarist and one of the founders of the modern Cuban Guitar School. 
Question : What was Isaac Nicola's city of birth?
The answer to this example can be: place of birth
Here is why: The question is about the place of birth of the Isaac Nicola. Hence the output is relevant and valid

OK. solve this:
Context : Riding in Cars with Boys is a 2001 film based on the autobiography of the same name by Beverly Donofrio about a woman who overcame difficulties, including being a teen mother, and who later earned a master's degree. 
Question : Which is the basis of Riding in Cars with Boys?
Answer:
based on