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: Forensic Medicine
[{'content': 'Depressed # of skull results from - \nSelect and explain. \nA. Heavy object with small striking surface, B. Heavy object with large striking surface, C. Fall over the ground, D. Light object', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Depressed/signature fracture are caused by heavy, weapon with small striking surface eg. hammer.', 'role': 'assistant'}]