Which of the following causes night blindness?

1. The retina contains photoreceptor cells called rods and cones. 2. Rods give vision in dim light and depend on vitamin A. 3. Vitamin A deficiency reduces the rod cells' ability to detect dim light. 4. The person then cannot see well at night, called night blindness. 5. So vitamin A deficiency causes night blindness. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_