Jason is a 21-year-old university student presenting with pain in the back of his right thigh. The pain started yesterday during soccer game. Jason went to kick the ball and felt an immediate 'pull' in the back of his right upper thigh. He had to limp off the field and reported mild pain in his right hamstring muscles with most active movements involving knee flexion and extension. Jason can still walk around without too much discomfort. a) What is the most likely cause of Jason's pain?

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