MRCP2-0972

A 55-year-old man with a medical history of type II diabetes, cardiovascular disease, and rosacea presents to the Dermatology Clinic with a blistering skin rash on sun-exposed areas. He is uncertain which medication may be responsible. Upon examination, he displays an erythematous blistering rash on his face, upper chest, and both arms. What medication is the probable culprit?