You will be given a definition of a task first, then some input of the task.
Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Sentence: Across town at the Limba Restaurant , the menu carries an assortment of dishes from Thailand , created by a chef who spent a decade in kitchens in San Francisco , where Asian food is prevalent .<sep>Span: by a chef
Output:
Who is the chef?