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
[{'content': 'In the rejection phenomenon after kidney transplant, the primary target for early immunological attack is - \nSelect and explain. \nA. Vascular endothelium, B. Renal papillae, C. Glomeruli, D. Proximal tubules', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Vascular endothelium", 'role': 'assistant'}]