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': "Secondary detion of the eye is based on the following law: \nSelect and explain. \nA. Hering's, B. Listing's, C. Donder's, D. Sherrington's", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. Hering's", 'role': 'assistant'}]