What are the four biological compounds in living things?

There are more than simply 4 biological compounds in the human body. I suppose to categorise, the question is hinting towards the molecules like Carbohydrates ( Poly and mono saccharides ) Proteins ( Polypeptides Made of amino acids) and Fats. There is also water, but I'm hesitant to class that as a biological compound, as it's not organic. 

Ihaven't done that yet, so no idea,but this is not the right place to ask

He should put sand around the spill in order to contain it so that it won't spread