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
Which of the following statement (s) is/are true about dengue fever -a) ↑ Hematocritb) ↓Plateletc) Positive tourniquet testd) Vector (Aedes aegypticus) usually bites in day time 
Select and explain. 
A. abc, B. acd, C. bcd, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None