sentence2_structure: Fission<>is<>the radioactive process used in nuclear power plants and one type of nuclear bomb$$$the radioactive process<>used<>in nuclear power plants and one type of nuclear bomb
sentence1: Called fission, the reaction is used in nuclear power plants and atomic bombs.
sentence2: Fission is the radioactive process used in nuclear power plants and one type of nuclear bomb.
question: What is the radioactive process used in nuclear power plants and one type of nuclear bomb?