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: Pathology
[{'content': 'Hess test is done to assess - \nSelect and explain. \nA. Bleeding time, B. Capillary fragility, C. Clotting time, D. Prothrombin time', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hess capillary resistance test or tourniquet test is done by tying sphygmomanometer\xa0cuff to the upper arm and raising it in between diastolic and systolic pressure for 5 minutes.\nPresence of more than 20 petechiae over the cubital fossa is considered a positive test.\nThe test is positive in increased capillary fragility as well as in thrombocytopenia.', 'role': 'assistant'}]