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: The chipping stone with an iron chisel, it is commonly a chip of the chisel and not of the stone which enters the eye.', 'role': 'assistant'}]