This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding disorders, Subject name: Pediatrics
[{'content': 'Platelet function is assessed by: \nSelect and explain. \nA. Platelet adhesion, B. BT, C. PFA-100, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Platelet function assessment: - PFA-100--This is a test to measure the platelet adhesion-aggregation in response to agonist combination like collagen epinephrine or collagen-ADP. - Bleeding time--The usual bleeding time is 4-8 minutes. Bleeding for a longer time suggests platelet defects.', 'role': 'assistant'}]