Social & Preventive Medicine Korsakoff’s psychosis is due to deficiency of: September 2003, March 2013 (b) A Vitamin B1 B Vitamin B2 C Vitamin B3 D Vitamin B12 💡 Explanation Korsakoff's psychosis is due to deficiency of: September 2003, March 2013 (b) ✓ Correct Answer: A. Vitamin B1