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': 'On a stained slide, clostridium tetani has the\nappearance of a: \nSelect and explain. \nA. Bunch of grapes, B. Chain of beads, C. Drumstick, D. Safety pin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]