Biochemistry Deficiency of which vitamin causes glossitis, dementia, roughed keratotic areas on skin and gastrointestinal symptoms? A Riboflavin B Pyridoxine C Niacin D Pantothenic acid 💡 Explanation Deficiency of which vitamin causes glossitis, dementia, roughed keratotic areas on skin and gastrointestinal symptoms? ✓ Correct Answer: C. Niacin