<prompt> Which of the following is the best marker for drug induced lupus?Anti histone antibodiesAnti DS DNAANAAnti Smith Ab  <response>: Drug induced lupus is associated with anti histone antibodies which are positive in 95 of cases. Ref: Harrisons Principles of Internal Medicine, 17th Edition, Page 2076; 16th 1961, 1967; Pathologic Basis of Disease, Robbins, 7th Edition, Page 229 235; Drug-Induced Diseases: Prevention, Detection, and Management, James E. Tisdale, 2nd Edition, Section 2, Page 108 