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: Physiology
[{'content': 'Exocytosis \nSelect and explain. \nA. Extrusion of cell bound vesicles, B. Intrusion of liquid particles, C. Instrusion of solid particles, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In exocytosis, the intracellular content to be released into the ECF fuses to the cell membrane. Then it is packed in a vesicle formed by the cell membrane and is released to the ECF.', 'role': 'assistant'}]