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': 'Rapid serological diagnostic tests include all except? \nSelect and explain. \nA. Latex agglutination, B. Spectrophotometry, C. Gel electrophoresis, D. Radioimmunoassay', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Spectrophotometry", 'role': 'assistant'}]