Q: Fact 1: Antigens are found on cancer cells and the cells of transplanted organs. Fact 2: If an antigen causes cancer, it is referred to as a pathogen. Given the two facts above, what are antigens also?

Choose from:
[a]. resistance.
[b]. negative.
[c]. humans.
[d]. positive.
[e]. pathogens.
[f]. more abundant.
[g]. complex.
[h]. Allergies.
The answer is:
[e].