This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Components of acellular peussis vaccine \nSelect and explain. \nA. PT + FHA + Fimbriae, B. PT + cytotoxin + fimbriae, C. Endotoxin + fimbriae + pili, D. Peactin + FHA + OMP + Fimbriae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: aP Avoids neuro side effects of whole cell peussis but less immunogenic', 'role': 'assistant'}]