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 concrete, the third surface is covered with grease, and the fourth surface is covered with oil.<sep>group: sliding <sep>question: Which brick slides the shortest distance?<sep>A: frost<sep>B: concrete<sep>C: grease<sep>D: oil
Output (English): The surface covered with concrete is the hardest for the brick to slide across.