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': 'Which of the following does not predispose to leukemia \nSelect and explain. \nA. Alcohol, B. Genetic disorder, C. Smoking, D. Chemical exposure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Leukemia risk factors\n1) General\n\nGender: Men are more likely to develop CML, CLL and AML than women.\nAge: The risk of most leukemias, with the exception of ALL, typically increases with age.\n\n2) Genetics\n\nFamily history: First-degree relatives of CLL patients, or having an identical twin who has or had AML or ALL,\xa0increases the risk for developing the disease.\nGenetic diseases: AML has been associated with Down syndrome,\xa0Klinefelter syndrome, Patau syndrome, Fanconi anemia, Bloom syndrome, Ataxia telangiectasia,\xa0and Kostmann syndrome, may play a role in the development of leukemia.\n\n3) Smoking\n\nSmoking cigarettes does increase the risk of developing AML\n\n4) Exposures \n\nRadiation : Exposure to high-energy radiation (e.g., atomic bomb explosions) and intense exposure to low- energy radiation from electromagnetic fields\xa0(e.g., power lines). \nChemical exposure: Long-term exposure to chemicals like benzene & ethylene oxide is considered to be a risk for leukemia.\nDrugs - alkylating agents & topoisomerase II inhibitors increase the risk of AML.\n\n5) Previous Cancer Treatment\n\nCertain types of chemotherapy and radiation therapy for other cancers are considered leukemia risk factors.', 'role': 'assistant'}]