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: Microbiology
[{'content': 'Diagonsis of tetanus is made by : \nSelect and explain. \nA. Culture of bacteria from wound, B. Clinically, C. Four fold raise in antibody against tetanus toxin, D. Gram staining of biopsy from wound', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]