This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medico legal procedures, Subject name: Forensic Medicine
[{'content': 'Law under oath is not necessary in - \nSelect and explain. \nA. Wound ceificate, B. Medical ceificate, C. Postmoem ceificate, D. Expe opinion expressed in a treatise', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Law under oath is not necessary in expe opinion expressed in a treatise Ref:synopsis of forensic medicine (Dr.K.S.Narayan Reddy), pg no:9,28th edition.', 'role': 'assistant'}]