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: Ophthalmology
[{'content': "S shaped eyelid is seen in \nSelect and explain. \nA. Arterio venous fistula, B. Ulcerative blepharitis, C. Plexiform neurofibroma, D. Horner's syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Plexiform neurofibromas - Bag of worm consistency and S shaped eyelid deformity.', 'role': 'assistant'}]