This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Le fo II fracture involves ? \nSelect and explain. \nA. Medial wall of orbit, B. inferior orbital rim, C. Lateral pyriform rims, D. Mastoid process', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MidFace fractures MidFace fractures involving the maxilla can be classified by fracture patterns as Le Fo I, II and III Le Fo I Fracture line runs above and parallel to palate Effectively seperates Alveolus and palate from the facial skeleton above Le Fo II Pyramidal in shape Passess through the root of nose, lacrimal bone, floor of orbit, upper pa of maxillary sinus and pterygoid plate Orbital floor is always involved Le Fo III Complete disjunction of the facial skeleton from the skull base Fracture line runs high through the nasal bridge, septum and ethmoid, and through the bones of orbit to the frontozygomatic suture Management Interdental or intermaxillary fixation is neccesary to re establish the proper dentoskeletal relationships, immombilize the fractured bones and ensure normal post operative occlusion Ref: Sabiston 20th edition Pgno :422', 'role': 'assistant'}]