This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Runt disease is associated with? 
Select and explain. 
A. Acute rejection, B. Hyperacute rejection, C. Chronic rejection, D. Graft versus host disease
D: Graft versus host disease
Answer: D: Graft versus host disease 
Explanation: Runt disease is Graft versus host disease.
Runt disease occurs when immunologically competent donor cells are transplanted into immunologically crippled (immunocompromised) hosts and the transferred cells recognize host cells as alloantigens.