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': 'Flow cytometry is done to know ? \nSelect and explain. \nA. Rapid cell shrinkage, B. Blood flow to brain, C. Net O2 supply to tissues, D. Amount of O2 bound to hemoglobin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rapid cell shrinkage", 'role': 'assistant'}]