This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "18 months old child presents with low grade fever, stridor and barking cough. His chest x-ray was taken and given below. \nThe line of treatment is \nSelect and explain. \nA. 3rd generation Cephalosporins, B. Heimlich's Maneuver, C. Reassurance, D. Single dose of Dexamethasone", 'role': 'user'}, {'content': 'Answer: D \nExplanation: The given case scenario is a case of Croup. X-ray shows steeple sign. Single dose of Dexamethasone is the treatment of choice.', 'role': 'assistant'}]