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: Surgery
[{'content': 'One of the disadvantages of breech loading, metallic type, self-aspirating, cartridge type syringe is \nSelect and explain. \nA. Autoclavable, B. Rust resistant, C. Piston is scored, D. Weight', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]