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
Whooping cough is caused by - 
Select and explain. 
A. B. pertussis, B. H. influenzae, C. Pneumococcus, D. Meningococcus
A: B. pertussis
Answer: A: B. pertussis 
Explanation: None