TASK DEFINITION: In this task, you are given a context paragraph of the tweet and question. Your task is to generate right answer of given question based on given context tweet paragraph.
PROBLEM: Context: If you're not concerned about AI safety, you should be. Vastly more risk than North Korea. Elon Musk (@elonmusk) August 12, 2017 Question: what is elon concerned with?

SOLUTION: ai safety

PROBLEM: Context: Wild rushing streams, clean enough to drink, melted glaciers pouring across the green summer landscapes. #Iceland — Andrew Evans (@WheresAndrew) July 16, 2014 Question: who is tweeting about glaciers melting and creating drinking water?

SOLUTION: andrew evans

PROBLEM: Context: Marc Stein @ESPNSteinLineThe Sixers, according to league sources, have claimed Mo Williams off waivers1/20/2017, 10:08:37 PM Question: who claimed mo williams off waivers?

SOLUTION:
the sixers