question: Q:A 6-year-old boy with a history of multiple fractures is brought to his pediatrician by his mother, because she is concerned her child cannot hear her. On physical exam, kyphoscoliosis, poor dentition, bowing of long bones, and conductive hearing loss is noted. On genetic analysis, the patient has a COL1A1 gene mutation. The defect found in this patient is most likely associated with impaired formation of which of the following?? 
  {'A': 'Blood vessels', 'B': 'Vitreous body of the eye', 'C': 'Lens', 'D': 'Cartilage', 'E': 'Sclera'},