Q. A 35-year-old male with a history of alcoholism presents to the emergency department with complaints of seizures, mouth sores, and a rash on his face. On examination, you note angular cheilitis, glossitis, stomatitis, and seborrheic dermatitis. His tongue appears swollen and beefy red. A neurological examination reveals peripheral neuropathy. The patient appears extremely irritable. Laboratory tests show anemia with ringed sideroblasts seen on bone marrow biopsy. What is the most likely diagnosis in this patient?