This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'The following statements are true about DPT vaccine except \nSelect and explain. \nA. Aluminium salt has a adjuvant effect, B. Whole killed bacteria of Bordetella peussis has an adjuvant effect, C. Presence of acellullar peussis component increases its immunogenecity, D. Presence of Hemophilus influenza type B component increases its immunogenicity', 'role': 'user'}, {'content': "Answer: D \nExplanation: Diphtheria toxoid is given as a trivalent preparation containing tetanus toxoid and peussis vaccine as the DTP or DPT. Not only it is convenient, but B.peusis also acts as an adjuvant for the toxoids, producing a better antibody response. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 267", 'role': 'assistant'}]