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: Gynaecology & Obstetrics
[{'content': 'Most common congenital hea disease during pregnancy - \nSelect and explain. \nA. ASD, B. VSD, C. TOF, D. AS', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANS. A. ASDAtrial Septal Defect (ASD) ostium secundum type is the most common congenitalhea disease encountered in pregnancy.', 'role': 'assistant'}]