A 20-year-old Caucasian man presents with a 1-month history of tingling sensations in his legs. He is on isoniazid treatment for pulmonary tuberculosis. On examination you note a greasy yellow scale over his scalp and eyebrows. Laboratory investigations reveal a hemoglobin level of 9 g/dl.
What is the most likely diagnosis?
A) Vitamin A deficiency
B) Pyridoxine deficiency
C) Vitamin C deficiency
D) Niacin deficiency
E) Vitamin E deficiency
