Which Vitamin(s) Could Contribute to the Following Symptoms or Disorders $\bullet$

Which vitamin(s) could contribute to the following symptoms or disorders or disease?
- $\bullet$ Wernicke's encephalopathy

A) ascorbic acid
B) biotin
C) vitamin D
D) folate
E) Riboflavin
F) niacin
G) vitamin B₁₂
H) thiamin