This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
[{'content': 'Cause(s) of Ophisthotonus is/are: \nSelect and explain. \nA. Cocaine, B. Strychnos Nux Vomica seed, C. Codeine, D. Curare', 'role': 'user'}, {'content': 'Answer: B \nExplanation: TONUS SEEN IN STRYCHNOS NUX VOMICA / KUCHILA : OpisthotonusQ - Backward bending of spine. emprosthotonusQ - Forward flexion of spine. pleurosthotonusQ - Lateral flexion of spine.', 'role': 'assistant'}]