question: Q:A 7-month-old boy is brought to the emergency department by his mother because of a 3-day history of vomiting and poor feeding. The vomit is non-bloody. He transitioned to pureed vegetables 10 days ago. Over the past 2 weeks, he has become increasingly irritable and within the past day has taken more daytime naps and appears much less responsive and interactive. His mother denies any history of fever or trauma at home. He has not received any vaccinations as his parents believe he is already healthy and does not need them. He spends most of the day with a babysitter while both parents are at work. He appears lethargic. His temperature is 37.8°C (100.1°F), pulse is 140/min, respirations are 18/min, and blood pressure is 90/55 mm Hg. The abdomen is soft and nontender. Auscultation of the heart and lungs shows no abnormalities. The anterior fontanelle is tense and bulging. Fundoscopic exam shows bilateral retinal hemorrhage. A complete blood count shows a leukocyte count of 10,000/mm3. An x-ray of the chest shows healing fractures of the 2nd and 3rd right ribs. Further evaluation of this patient is most likely to show which of the following findings?? 
  {'A': 'Mass in the posterior fossa', 'B': 'Vitamin deficiency', 'C': 'Bacterial infection', 'D': 'Diffuse axonal damage', 'E': 'Type I collagen synthesis defect'},