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: Social & Preventive Medicine
HPV (Human papilloma virus) vaccine is: 
Select and explain. 
A. Monovalent, B. Bivalent, C. Quadrivalent, D. Bivalent and Quadrivalent
D: Bivalent and Quadrivalent
Answer: D: Bivalent and Quadrivalent 
Explanation: Bivalent and Quadrivalent