This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malnutrition, Subject name: Pediatrics
[{'content': 'What is the most common underlying cause responsible for the disease in which this X ray finding is seen? \nSelect and explain. \nA. Calcium deficiency, B. Phosphate deficiency, C. Vit D deficiency, D. Vit C deficiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The given X rays shows widening, cupping & fraying at metaphyseal ends of forearm bones- suggestive of Rickets Vitamin C deficiency- Pencil thin coex, Pelken spurs, Wimberger ring sign', 'role': 'assistant'}]