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: Medicine
[{'content': 'Holt Gram syndrome is characterized by \nSelect and explain. \nA. ASD, B. VSD, C. TGA, D. AR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]