Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
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Question: Context : The Cython programming language is a superset of Python with a foreign function interface for invoking C/C++ routines and the ability to declare the static type of subroutine parameters and results, local variables, and class attributes. 
Answer : Python

Answer: The Cython is based upon what?


Question: Context : The series follows adventures of Dipper Pines (voiced by Jason Ritter) and his twin sister Mabel (voiced by Kristen Schaal) in the fictional town of Gravity Falls, Oregon, while on summer vacation. 
Answer : Oregon

Answer: Which place does Gravity Falls exist in?


Question: Context : The Portrait of Lorenzo di Credi is a painting by the Italian Renaissance artist Perugino, dating to around 1504 and housed in the National Gallery of Art, Washington, DC, United States. 
Answer : National Gallery of Art

Answer:
What is the name of the place where Portrait of Lorenzo di Credi can be found?