Night blindness is a classic manifestation deficiency of:

Step 1: Identify the condition described. The question asks about the deficiency that causes night blindness. Step 2: Recall the role of essential nutrients in vision. Night blindness, also known as nyctalopia, is a condition where vision is impaired in low light. Vitamin A* (retinol) is a fat-soluble vitamin essential for good vision, particularly in dim light. It is a crucial component of rhodopsin, a light-sensitive pigment found in the rod cells of the retina. Step 3: Determine the specific deficiency. A deficiency in Vitamin A leads to an insufficient amount of rhodopsin, impairing the eye's ability to adapt to darkness, thus causing night blindness. Night blindness is a classic manifestation of a deficiency of Vitamin A. Vitamin A That's 2 down. 3 left today — send the next one.