This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Haemopoietic malignancy is seen in \nSelect and explain. \nA. HTLV -1, B. EBV, C. Parvo B19, D. HHV - 8', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Human T-cell leukemia virus type 1 (HTLV-1) is a causative agent of a malignant disease of peripheral CD4+ T cells called adult T-cell leukemia-lymphoma (ATL) and several inflammatory diseases such as HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). Ref Davidson 23rd edition pg 1091', 'role': 'assistant'}]