This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
[{'content': 'Xenograft is: \nSelect and explain. \nA. Graft across species, B. Graft from same species, C. Graft from same individual, D. Graft from same organ', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: CMDT 2018, P 157* Autologous graft (autograft): Within an individual, auto transplantation* Syngeneic graft (syngraft, isograft): Identical twins, isotransplantation* Allogeneic graft (allograft, homograft): Non-identical, allotransplantation* Xenogeneic graft (heterologous graft, heterograft): Between species, xenotransplantation', 'role': 'assistant'}]