53-year-old woman presents to her GP for a follow-up visit after having high BP on her last visit. She is again found to be hypeensive and was prescribed hydralazine, a b-blocker, and furosemide. The woman takes no additional prescription or over-the-counter medications. She complains of muscle aches, joint pain, and rash. Physical exam reveals a temp. of 37.7degC (100.0degF) and a scaling erythematous rash on her face. The physician orders an autoantibody panel: Antinuclear antibodies (ANA): Positive Anti-histone antibodies: Positive What is the most likely diagnosis?