Task: Question Answering
Input (English): The Russian thistle, commonly known as the tumbleweed, is a big, round plant with many branches and short, stiff leaves. This plant spreads a large number of seeds when it breaks off from its stalk. The thistle is most likely found in what kind of environment?  
 (A) swamp (B) prairie (C) forest (D) tundra
Output (English): B