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': 'False about primary immune response \nSelect and explain. \nA. Immune response against subsequent antigenic challenge, B. Lag period is longer., C. Slow, Sluggish and short lived, D. All the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Immune response against primary antigenic challenge - Primary immune response.', 'role': 'assistant'}]