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': 'The color of granules in mycetoma caused by Actinomadura pelletieri - \nSelect and explain. \nA. Black, B. Yellow, C. Red, D. Brown', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]