UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 0829
Question:
A 55 year old complains of a scaly and reddened rash on his skin. He noticed that this usually occurs after exposure to sunlight. He admits to recent weakness, diarrhea and weight loss. Examination is unremarkable except for a slight tremor. Which of the following Vitamins is most likely to be deficient?

a) Vitamin B1
b) Vitamin B2
c) Vitamin B12
d) Nicotinic acid
e) Folic acid