Ophthalmology A chronic tobacco chewer came to OPD with diminution of vision. Which of the following nutritional supplement can be provided to him: A Vitamin B1 B Vitamin B2 C Vitamin B6 D Vitamin B12 💡 Explanation A chronic tobacco chewer came to OPD with diminution of vision. Which of the following nutritional supplement can be provided to him: ✓ Correct Answer: D. Vitamin B12