This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: VBDs, Arboviral & Viral Infections, Surface Infections, Subject name: Social & Preventive Medicine
Which dengue serotype has higher risk of causing Dengue hemorrhagic fever as Secondary infection? 
Select and explain. 
A. DENV-1, B. DENV-2, C. DENV-4, D. DENV-3
B: DENV-2
Answer: B: DENV-2 
Explanation: Secondary infection with dengue serotype 2 or multiple infection with different serotypes lead to severe form dengue DHF/DSS.