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': '10 days old baby develops swelling left in posterior cervical area, bluish in appearance, increase in size on crying and brilliently transilluminant \nSelect and explain. \nA. Parotiditis, B. Hemangioma, C. Cystic hygroma, D. Lymph node', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Cystic hygroma Cystic hygroma Usually present in neonate or early infancy. Filled with lymph Commonly present in posterior cervical area, axilla, mediastinum, parotid, floor of mouth. Soft & paially compressible Size increase during crying, coughing Brilliently transilluminant Sometimes size increase with age or during infection. Treatment is complete excision.", 'role': 'assistant'}]