Task: Question Answering
Input (English): Passage: The Raiders' fourth game was an AFC duel with the Texans at home ground. The Raiders trailed early in the 1st quarter as RB Derrick Ward got a 33-yard TD run. The Raiders replied with RB Michael Bush making a 2-yard TD run. The Raiders fell behind again when QB Matt Schaub completed an 11-yard TD pass to TE Joel Dreessen. The Raiders responded in the 2nd quarter with QB Bruce Gradkowski getting a 13-yard TD pass to FB Marcel Reece. In the 3rd quarter the Texans started to rally with RB Arian Foster making a 74-yard TD run, followed by kicker Neil Rackers getting a 35-yard field goal, then in the 4th quarter Schaub threw a 10-yard TD pass to RB Arian Foster. The Raiders tried to fight back when Gradkowski found TE Zach Miller on a 14-yard TD pass, and then kicker Sebastian Janikowski nailed a 39-yard field goal, but the Texans' defense prevented any more chances. 
Question: How many touch down yards did michael bush run? 
Answer type: Number 
Output (English): 2.