You are presented with the question "A molecule that causes antibody production is found on what?" and the following answer choices: 
- solid, liquid, gas
 - organs
 - Epidermis
 - aqueous solution
 - the skin
 - animals
 - cancer cells
 - humans

Now knowing that antigens are found on cancer cells and the cells of transplanted organs and antigens can be any molecule that causes antibody production, choose the best answer.


 

       cancer cells  