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
The process by which fusion of pa of a cell membrane occurs is/are 
Select and explain. 
A. Cell division, B. Endocytosis, C. Exocytosis, D. Virus replication
B: Endocytosis
Answer: B: Endocytosis 
Explanation: In Endocytosis the cell membrane fuses around the receptor. Example is cells take up cholesterol contained in low-density lipoprotein. (REF: GANONG&;S REVIEW OF MEDICAL PHYSIOLOGY)