Transplanting other people's organs into the patient's body is not easy to survive. From the concept of immunity, the transplanted organ is equivalent to______
A. pathogen
B. vaccine
C. Antibodies
D. Antigen
Answer:D
Transplanting other people's organs into the patient's body is not easy to survive. From the concept of immunity, the transplanted organ is equivalent to______
A. pathogen B. vaccine C. Antibodies D. Antigen