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': 'A child presented with difficulty in seeing the blackboard in school. His teachers say that he frequently squeezes his eyes. Most probable cause is – \nSelect and explain. \nA. Hypermetropia, B. Myopia, C. Presbyopia, D. Astigmatism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Difficulty in seeing distant object (blackboard) and frequent squeezing of eye are features of myopia.', 'role': 'assistant'}]