This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasm of Mature B & T Cells, Subject name: Pathology
[{'content': 'Post transplant lymphoma occurs due to proliferation of which of the following cells? \nSelect and explain. \nA. T cell, B. B cell, C. NK cell, D. Monocyte', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Post transplant lymphoma (Post transplant Lymphoproliferative Disorder or PTLD) occurs due to proliferation of B cells', 'role': 'assistant'}]