This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Receptor-mediated endocytosis is by \nSelect and explain. \nA. Clathrin, B. Porine, C. Cytocin, D. Vimentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Very large paicles enter the cell by a specialized function of the cell membrane called endocytosis. The principal forms of endocytosis are pinocytosis and phagocytosis.Pinocytosis means ingestion of minute paicles that form vesicles of extracellular fluid and paiculate constituents inside the cell cytoplasm. Phagocytosis means ingestion of large paicles, such as bacteria, whole cells, or poions of degenerating tissue.Ref: Guyton; 13th edition; Chapter 2 The Cell and Its Functions', 'role': 'assistant'}]