Option 1 is incorrect. The state list refers to subjects on which the state governments have the power to make laws. Public health and sanitation fall under the state list, but it does not cover the entire list of subjects in the state list.

Option 2 is correct. The union list refers to subjects on which the central government has the power to make laws. Citizenship, naturalization, and aliens are included in the union list, which means that the central government has the authority to legislate on these matters.

Option 3 is incorrect. The concurrent list refers to subjects on which both the central and state governments have the power to make laws. Legal, medical, and other topics do fall under the concurrent list, but it does not cover the entire list of subjects in the concurrent list.

Option 4 is incorrect. While legal, medical, and other topics do fall under the concurrent list, it is not the only content on the concurrent list.