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': 'All are true about chromobacteritun violaceum except? \nSelect and explain. \nA. Gram negative, B. Produces violet-colored pigment, C. Normal flora in human, D. Causes cellulitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. Normal flora in human', 'role': 'assistant'}]