This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': "Escherichia coli gives pink color with \nSelect and explain. \nA. Chocolate agar, B. LJ medium, C. MacConkey's medium, D. Saline broth", 'role': 'user'}, {'content': "Answer: C \nExplanation: Escherichia Coli is a gram-negative, straight rod. Has good growth in ordinary media. On MacConkey medium, grows pink colonies due to lactose fermentation. On blood agar hemolytic colonies. In broth general turbidity and heavy deposit, disperse completely on shaking. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 280", 'role': 'assistant'}]