Instructions: You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.
Input: Nearly two-thirds of the valley's land area is part of the city of Los Angeles. The other incorporated cities in the valley are Glendale, Burbank, San Fernando, Hidden Hills, Agoura Hills, and Calabasas.
Output:
is glendale part of the san fernando valley?