This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
[{'content': 'Father of ophthalmology? \nSelect and explain. \nA. William Osler, B. Sushruta, C. Albrecht Von Graefe, D. David James', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Father of Ophthalmology = Albrecht Von Graefe Von Graefe sign= lid lag sign in hypehyroidism Pseudo Von Graefe sign= seen in abberant 3rd nerve regeneration', 'role': 'assistant'}]