The earliest clinical sign of vitamin A deficiency is -: (A) Conjunctival xerosis, (B) Corneal xerosis, (C) Bitots spots, (D) Keratomalacia
Answer is A. Conjuctival xerosis is the early manifestation of vitamin A deficiency. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 568