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: These 4th graders from L.A. spent the weekend learning about US history and government. Now they're seeing #inaug2013. Obama Inauguration (@obamainaugural) January 21, 2013 Answer: 4th grade
what grade spent several days learning about united states history and government?