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: Pediatrics
[{'content': 'The most common type of total anomalous pulmonary venous connection is – \nSelect and explain. \nA. Supracardiac, B. Infracardiac, C. Mixed, D. Cardiac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Type I TAPVC with anomalous connection at the supracardiac level is the most common type accounting for about 45% of all cases.\nTotal anomalous pulmonary venous connection \n\nTotal anomalous pulmonary venous connection (TAPVC) is characterized by abnormal drainage of pulmonary veins into the right heart either by direct connection into the right atrium or into its tributaries.\nAccording to the site or level of connection of the pulmonary veins to the systemic venous system TAPVC has been classified into four types.\n\nType 1(45%)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Anomalous connection at supracardiac level (Pulmonary veins drain into left irmonimate vein or SVC)\nType II (25%)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Anomalous connection at cardiac level (Pulmonary veins joint the coronary sinus or enter right atrium directly)\nTyep III (25%)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Anomalous connection at infracardiac level (Pulmonary veins drain into the portal vein)\n\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Type IV (5%)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Anomalous connection at multiple levels', 'role': 'assistant'}]