<prompt> Which of the following is not true about the risk factors of systemic sclerosis?Human CMV infectionHuman parvovirus B 19 infectionMiners exposed to leadDrugs like bleomycin  <response>: 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. 