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': 'Most common occular foreign body is : \nSelect and explain. \nA. Chiesel and hammer, B. Glass, C. Plastics, D. Stone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Chisel and hammer', 'role': 'assistant'}]