The given correct answer, "drop bomb on Hiroshima," refers to the action taken by the United States during World War II when they dropped an atomic bomb on the city of Hiroshima, Japan. This event occurred on August 6, 1945, and resulted in the deaths of an estimated 140,000 people. The bombing of Hiroshima was a significant moment in history as it marked the first use of a nuclear weapon in warfare. The decision to drop the bomb was made as a strategic move to force Japan's surrender and bring an end to the war.