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: Biochemistry
[{'content': 'Which of the following phospholipid serves as a marker of apoptosis \nSelect and explain. \nA. Phosphatidylinosital, B. Phosphatidyl serine, C. Phosphatidyl choline, D. Phosphatidyl ethanolamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Phosphatidyl serine is normally present on inner mitochondrial membrane, flipping of it to the outer mitochondrial membrane is seen in apoptosis.', 'role': 'assistant'}]