(B) The correct answer is $B$. Nicotinic acid is also known as Vitamin $B_3$ or Niacin. Prolonged deficiency of nicotinic acid leads to a condition kn

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(B) The correct answer is $B$. Nicotinic acid is also known as Vitamin $B_3$ or Niacin. Prolonged deficiency of nicotinic acid leads to a condition known as Pellagra. Pellagra is clinically characterized by the '$3D$' symptoms: dermatitis (scaly skin),diarrhea,and dementia (mental disturbance),often accompanied by inflammation of the mucous membranes.