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': "Assessment of the visual acuity in children below 2 years of age can be made by the following tests, except: \nSelect and explain. \nA. Landolt's chas, B. Pattern visual evoked potential, C. Preferential looking behaviour, D. Optokinetic nystagmus", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. Landolt's chas", 'role': 'assistant'}]