Task: Question Understanding
Input (English): Question: A student wraps a wire around an iron nail. The student then connects the wire to a battery. The nail attracts another nail and they stick together. What force holds the two nails together? (A) gravitational force (B) magnetic force (C) electric force (D) friction force?
Output (English): wire, iron, nail, attracts, another, nail, force, holds, nails, together?