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': 'For experimental work, Lepra bacilli are best cultured in - \nSelect and explain. \nA. Armadillos, B. Mouse foot pad, C. Guinea pigs, D. Rabbit testes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]