Task: Question Generation
Input (English): context: A person is sliding four bricks across four hard surfaces. The first surface is covered with frost, the second surface is covered with grease, the third surface is covered with rubber, and the fourth surface is covered with oil.<sep>group: sliding <sep>question: Which brick slides the shortest distance?<sep>A: frost<sep>B: grease<sep>C: rubber<sep>D: oil
Output (English): The surface covered with rubber is the hardest for the brick to slide across.