This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanical Injuries, Subject name: Forensic Medicine
[{'content': 'Characteristic amnesia of post traumatic brain injury \nSelect and explain. \nA. retrograde amnesia, B. anterograde amnesia, C. remote amnesia, D. All are true', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Anterograde amnesia is characteristically seen in post traumatic brain injury Amnesia following head injuries is common and mostly associated with concussion. Concussion : due to head injury a state of temporary unconsciousness which comes on immediately after injury, is always followed by amnesia and recovers spontaneously The memory of distant events returns before the memory of recent events. Post-traumatic amnesia can range from minutes to days, and its duration is propoional to the severity of the injury Permanent retrograde amnesia can vary from a time of seconds up to seven days Retrograde amnesia can also occur in injuries in which consciousness is not lost.', 'role': 'assistant'}]