Casal's necklace is seen in deficiency of: September 2012
Ans: B i.e. Niacin The Casal collar or Casal necklace is a clinical sign in which there is erythematous pigmented skin rash in the distribution of a broad collar (dermatomes C3 and C4). It is seen in patients with pellagra.
Vitamin A deficiency
Niacin
Vitamin B12 deficiency
Iron deficiency anemia