This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Lipids, Subject name: Biochemistry
[{'content': 'Which of the following phospholipid has antigenic activity: \nSelect and explain. \nA. Plasmalogen, B. Cardiolipin, C. Phosphatidyl choline, D. Sphingomyelin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cardiolipin Phospholipid Found only in mitochondria. Antigenic (usually phospholipids are not antigenic). Anticardiolipin antibodies are found in APLA Syndrome', 'role': 'assistant'}]