This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Superior rib notching is not associated with which of the enlisted conditions? \nSelect and explain. \nA. Hyperparathyroidism, B. Marfan syndrome, C. Blalock-Taussig shunt, D. Systemic lupus erythematosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]