A 52 year old alcoholic man complains of painful lesions on his tongue and inside his mouth. He also has pigmented scales on his face and both hands. He is weak, forgetful and suffers of burning sensation in several parts of his body. He mentions that he has diarrhea for the last two months. Deficiency of which of these vitamins is responsible for this patient’s condition? A- Vitamin A B- Vitamin B3(niacin) C- Vitamin C D- Vitamin D E- Folic acid http://medical-usmle.com/?p=1089
