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: Medicine
Tourniquet test is used in daily follow-up of patients with: 
Select and explain. 
A. Zika virus, B. Dengue virus, C. Chikungunya, D. Swine flu
B: Dengue virus
Answer: B: Dengue virus 
Explanation: Ans: B. Dengue virus(Ref: Harrison 19/e p1322)Tourniquet test is used in daily follow up of patients with dengue virusThe tourniquet test (capillary-fragility test):Pa of the new WHO case definition for dengue.The test is a marker of capillary fragility and it can be used as a triage tool to differentiate patients with acute gastroenteritis, for example, from those with dengue.It is a clinical diagnostic method to determine a patient's hemorrhagic tendency, fragility of capillary walls and thrombocytopenia.