A 30-year-old woman presents with a 2-week history of small wounds on the sides of her mouth. She recently adopted a strict vegetarian diet. On examination, you note she has pale conjunctivae, a magenta tongue, and macerated lips (in addition to the angular stomatitis).
What is the most likely diagnosis?
A) Thiamine deficiency
B) Riboflavin deficiency
C) Vitamin K deficiency
D) Vitamin D deficiency
E) Iron deficiency
