This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is not a type of VDPV? \nSelect and explain. \nA. mVDPV, B. aVDPV, C. iVDPV, D. cVDPV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vaccine derived polio virus ( VDPV) ard divided in to 3 categories. cVDPV- when evidence of person to person transmission exists in community. iVDPV- Immuno deficient associated VDPV, which are isolates from persons with primary immunodeficiency, who have prolonged VDPV infections. aVDPV- Ambiguous VDPV,which are either clinical isolates from person with no known immunodeficiency or sewage isolates whose source is unknown. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg, 219', 'role': 'assistant'}]