This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Scurvy, Subject name: Pediatrics
[{'content': 'A 5 month-old-baby (exclusively cow milk fed) presented to pediatrics OPD with history of crying on touch. Cause may be: \nSelect and explain. \nA. Scurvy, B. Rickets, C. JRA, D. Osteogenesis imperfecta', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Deficiency of Vitamin C Sub periosteal hemorrhage involving long bones- crying on touch', 'role': 'assistant'}]