Cheilosis is the deficiency of:

Correct option is B

Cheilosis, characterized by cracking and inflammation at the corners of the mouth and lips, is primarily caused by a deficiency of Vitamin B₂ (Riboflavin). This vitamin plays a vital role in energy production and maintaining healthy skin and mucous membranes. Deficiency can also cause glossitis, sore throat, and photophobia, and is often seen in malnourished individuals.
Explanation of options: (a) Vitamin B₁ – Deficiency of Vitamin B₁ (Thiamine) leads to beriberi, which affects the cardiovascular and nervous systems, not typically cheilosis. (b) Vitamin B₂ – This is the correct answer. Riboflavin deficiency leads to cheilosis, glossitis, and other symptoms affecting the mouth and eyes. (c) Vitamin B₃ – A deficiency in Niacin (Vitamin B₃) leads to pellagra, which presents with the 3 D’s: dermatitis, diarrhea, and dementia—not cheilosis. (d) Vitamin B₆ – Pyridoxine (Vitamin B₆) deficiency can cause irritability, depression, and neuropathy, but cheilosis is not the main symptom.