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 diagnosis of gonorrohea is established by: \nSelect and explain. \nA. Complement fixation tests, B. Pili agglutination tests, C. Hem agglutination tests, D. All of the above tests', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is. a. Complement fixation tests', 'role': 'assistant'}]