Answer the following question given this paragraph: 

An atomic bomb explodes and generates a huge mushroom cloud. The tremendous energy released when the bomb explodes is incredibly destructive. Where does all the energy come from? The answer is the nucleus of the atom.


Q: Where does the energy from an atomic bomb come from?

 Choices:

- isotope of atom

- electron shell

- neutron

- nucleus of atom

A:
nucleus of atom
