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': 'Clinical features of H. influenzae is/are: \nSelect and explain. \nA. Most frequently by biotype-I of type B strain, B. Occur in children (<2 years of age) due to absence of PRP antibodies, C. Most common complication of its meningitis – subdural effusion, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]