This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
All are affected in Graft-Versus host reaction except? 
Select and explain. 
A. Skin, B. G.I.T., C. Liver, D. Lung
D: Lung
Answer: D: Lung 
Explanation: Acute GVHD causes epithelial cell necrosis in three principal target organs liver,skin,gut Reference:Robbins basic pathology 9th edition pg no 139: