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Which one is a hereditary disease?

1. Cataract
2. Leprosy
3. Blindness
4. Phenylketonuria

Correct answer: Phenylketonuria

Solution

Phenylketonuria (PKU) is a hereditary metabolic disorder caused by mutations in the gene for phenylalanine metabolism. The other options are not classic hereditary diseases in this context: leprosy is infectious, and cataract/blindness can have many causes.

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