This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'String of pearl appearance seen in: \nSelect and explain. \nA. Clostridium, B. Bacillus anthracis, C. Pneumococcus, D. Staph, aureus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Bacillus anthracisOn penicillin agar-string of pearl appearance is seen and in Gelatin stab culture inverted fir tree appearance is seen.", 'role': 'assistant'}]