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: Medicine
[{'content': 'Which of the following is not true about the risk factors of systemic sclerosis? \nSelect and explain. \nA. Human CMV infection, B. Human parvovirus B 19 infection, C. Miners exposed to lead, D. Drugs like bleomycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Miners exposed to leadPatients with Systemic sclerosis (SSc) have increased serum antibodies to human cytomegalovirus (hCMV), and antitopoisomerase-I (Scl-70) autoantibodies recognize antigenic epitopes present on the hCMV-derived proteins.Drugs implicated in SSc-like illnesses include bleomycin, pentazocine and cocaine, and appetite suppressants linked with pulmonary hypeension.', 'role': 'assistant'}]