AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
D. Cataract — The condition in which the crystalline lens becomes milky and cloudy, causing partial or complete loss of vision, is called cataract.
Source: Chapter 10, Section 10.1 (The Human Eye)
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The passage explicitly states: "Sometimes, the crystalline lens of people at old age becomes milky and cloudy. This condition is called cataract." Myopia, Hypermetropia, and Presbyopia are refractive defects — they do not involve the lens turning cloudy. Always link cataract to the key phrase "milky and cloudy crystalline lens."