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: Fission is the process used in the first nuclear weapons and in power plants.
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?