You are answering a USMLE-style medical question. Question: A 44-year-old obese African-American male presents to clinic with complaints of 3 days of fatigue and dark urine. He has had several similar episodes since birth, all of which resolved spontaneously. He has a 5-year history of poorly controlled type II diabetes mellitus and was started on glipizide one week ago. Prior to the episode, he felt well without any upper respiratory or gastrointestinal symptoms. He predominantly eats fast food, although he tried a new Lebanese restaurant about one month ago. Which of the following is the most likely cause of this patient's symptoms? Options: A) Bacterial Infection B) Food C) Medication D) Idiopathic Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.