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: Anatomy
[{'content': 'Primary defect in structure is known as: \nSelect and explain. \nA. Malformation, B. Deformation, C. Anomaly, D. Mutation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Malformation', 'role': 'assistant'}]