Social & Preventive Medicine Prevalence of Vitamin-A deficiency in a community is assessed as: A Night blindness-10% B Corneal ulcer-0.01% C Bitot spots-0.5% D Decreased serum retinol level-0.05% 💡 Explanation Prevalence of Vitamin-A deficiency in a community is assessed as: ✓ Correct Answer: C. Bitot spots-0.5%