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': 'Pleomorphic bacteria is: \nSelect and explain. \nA. Changing shape with time, B. Rod shaped structure, C. Dumble shape, D. Bacteria in clusters', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pleomorphic bacteria: Pleomorphic bacteria (e.g., Yersinia pestis) may show considerable variation in size and shape called pleomorphism.\nParija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:17', 'role': 'assistant'}]