This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Etiological Factors of Neoplasia, Subject name: Pathology
[{'content': 'All of the following statements are true regarding human T cell leukemia virus 1 except: \nSelect and explain. \nA. It causes adult T cell lymphoma/leukaemia, B. It has tropism for CD 8 + T cell, C. It has long latent period of about 40 to 60 years, D. Leukaemia develop in only 3 to 5% of infected individual', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HTLV1 causes adult T-cell leukemia/lymphoma (ATLL) Similar to the human immunodeficiency virus, which causes AIDS, HTLV-1 has tropism for CD4+ T cells, and hence this subset of T cells is the major target for neoplastic transformation. A high fraction of the leukemias express the transcription factor Fox P3, a marker of regulatory T cells (Tregs) that act to suppress immune responses.', 'role': 'assistant'}]