This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': "Memory cells don't undergo apoptosis due to the presence of which growth factor? \nSelect and explain. \nA. Platelet derived growth factor, B. Nerve growth factor, C. Insulin like growth factor, D. Fibroblast growth factor", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nerve growth factor was the first identified protein with anti-apoptotic activity on neurons. This prototypic neurotrophic factor, together with the three structurally and functionally related growth factor. Hence nerve cells don&;t undergo apoptosis.', 'role': 'assistant'}]