This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
HPV vaccine is - 
Select and explain. 
A. Monovalent, B. Bivalent, C. Quadrivalent, D. Both bivalent and quadrivalent
D: Both bivalent and quadrivalent
Answer: D: Both bivalent and quadrivalent 
Explanation: HPV vaccine containing anyigen from6,11,16&18 REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.553