You are answering a USMLE-style medical question. Question: A 27-year-old woman with a history of bipolar disorder presents for a 3-month follow-up after starting treatment with lithium. She says she has been compliant with her medication but has experienced no improvement. The patient has no other significant past medical history and takes no other medications. She reports no known allergies. The patient is afebrile, and her vital signs are within normal limits. A physical examination is unremarkable. The patient is switched to a different medication. The patient presents 2 weeks later with an acute onset rash on her torso consisting of targetoid lesions with a vesicular center. She says the rash developed 2 days ago which has progressively worsened. She also says that 1 week ago she developed fever, lethargy, myalgia, and chills that resolved in 3 days. Which of the following drugs was this patient most likely prescribed? Options: A) Lamotrigine B) Valproate C) Olanzapine-fluoxetine combination (OFC) D) Paroxetine Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.