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': 'Gram-negative cocci is \nSelect and explain. \nA. Nisseria, B. Helicobactor, C. Cholera, D. Campylobactor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Neisseria is a gram-negative coccus typically arranged in pairs. Vibrio cholerae are gram-negative, curved bacilli. Campylobacter is gram-negative rods, typically comma-shaped. Helicobacter is a gram-negative spiral rod. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 230", 'role': 'assistant'}]