<prompt> Casals Necklace pattern is seen inThiamine deficiencyRiboflavin deficiencyNiacin deficiencyAll of the above  <response>: C Niacin deficiency Casal collar or Casal Necklace is a clinical sign in which there is an erythematous pigmented skin rash in the distribution of a broad collar dermatomes C3 and C4. It is seen in patients with pellagra. 