Nutrition and Vitamin Deficiencies · USMLE Step 1

Deficiency of which vitamin leads to cheilosis, angular stomatitis, and corneal vascularization due to impaired maintenance of mucous membranes?

  1. Vitamin B2 (riboflavin)
  2. Vitamin B12 (cobalamin)
  3. Vitamin B6 (pyridoxine)
  4. Vitamin C (ascorbic acid)
Show answer and explanation

Correct answer: Vitamin B2 (riboflavin)

Riboflavin (vitamin B2) deficiency affects carbohydrate and protein metabolism and mucous-membrane integrity, leading to cheilosis, angular stomatitis, and corneal vascularization.

Difficulty: Medium Question 7 of 21

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