You are presented with the question "What are antigens also?" and the following answer choices: 
- resistance
 - negative
 - humans
 - positive
 - pathogens
 - more abundant
 - complex
 - Allergies

Now knowing that antigens are found on cancer cells and the cells of transplanted organs and if an antigen causes cancer, it is referred to as a pathogen, choose the best answer.


 

     pathogens    