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
Drug-induced lupus antibodies are found in - 
Select and explain. 
A. Anti-histone antibody, B. Anti-Rho, C. Ds-DNA, D. Anti-Sm
A: Anti-histone antibody
Answer: A: Anti-histone antibody 
Explanation: Drug-induced lupus erythematosus 

A lupus like syndrome may develop in patients receiving a variety of drugs,
Procainamide and hydralazine are the most common offenders,
Most patients do not have symptoms of lupus erythematosus.
Anti-ds DNA antibody is rare
There is an extremely high frequency of antihistone antibodies.
Although multiple organs may be affected by renal and CNS involvement, usually does not occur.