This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tetralogy of Fallot, Subject name: Pediatrics
[{'content': "Severity of cyanosis in fallot's physiology is best decided by? \nSelect and explain. \nA. Size of V.S.D, B. Overriding of aoa, C. Degree of RVH, D. Degree of pulmonary stenosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: --> Severity of TOF is: Directly propoional to severity of cyanosis & Inversely propoional to intensity & duration of murmur - which depends on degree of pulmonary stenosis', 'role': 'assistant'}]