Given the task definition and input, reply with output. In this task, you are given a context tweet and an answer. Your job is to generate a question for the given answer based on the given tweet paragraph. Note that your question should be answerable based on the given tweet, and the answer to your question should be the given answer.

Context: Just shared a moment of silence on the set for Robin Williams, a man who brought so much laughter, joy and healing to so many. Lena Dunham (@lenadunham) August 12, 2014 Answer: robin williams
who did they share a moment of silence on set for?