This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cyanotic Congenital Heart Disease, Subject name: Pediatrics
[{'content': 'Not a component of tetralogy of fallot - \nSelect and explain. \nA. Pulmonary stenosis, B. Ventricular septal defect, C. Overriding aorta, D. Patent ductus arteriosus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Patent ductus arteriosus Tetralogy of falloto TOF is the commonest cyanotic congenital heart disease.o It has four componentsi) VSDii) Pulmonic stenosisiii) Overriding or dextroposed aortaiv) Right ventricular hypertrophyo Pulmonic stenosis (right ventricular outflow obstruction) is mainly due to infundibular stenosis. Obstruction at pulmonary valve level (valvular stenosis) is very uncommon (only 10%)."Pentology of fallot consists of components of TOF plus atrial septal defect"', 'role': 'assistant'}]