Android load fragment from backstack

For example my current fragment is catetegory fragment . It was loaded from option Fragment. now click on button i want to load option Fragment from backstack then following code may help.

btnBack.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    getActivity().getSupportFragmentManager().popBackStack();
    getActivity().getSupportFragmentManager().beginTransaction()
      .remove(CategoryFragment.this).commit();
   }
  });