Human nutrition: Identify the vitamin deficiency that causes night blindness. Full question: Night blindness (poor vision in dim light) is caused by a deficiency of which vitamin? Choose the correct option.
General Knowledge
Biology
Difficulty: Easy
Choose an option
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AVitamin A (retinol)
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BVitamin B₂ (riboflavin)
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CVitamin C (ascorbic acid)
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DVitamin D (calciferol)
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EVitamin K (phylloquinone)
Answer
Correct Answer: Vitamin A (retinol)
Explanation
ConceptNight blindness results from inadequate vitamin A, needed to form retinal (11-cis-retinal) for the visual pigment rhodopsin in rod cells.
MechanismLow vitamin A → impaired rhodopsin regeneration → poor scotopic (low-light) vision.
Final AnswerVitamin A (retinol).