Which of the following conditions is NOT caused by a deficiency of vitamin C?

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Impaired collagen productionSwollen and tender gumsPigeon chest deformityBleeding under the skin and other hemorrhages

Explanation

Vitamin C deficiency leads to impaired collagen synthesis, resulting in symptoms such as soft, swollen gums and subcutaneous hemorrhages. However, pigeon chest deformity is not associated with a lack of vitamin C.