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
Superior rib notching is not associated with which of the enlisted conditions? 
Select and explain. 
A. Hyperparathyroidism, B. Marfan syndrome, C. Blalock-Taussig shunt, D. Systemic lupus erythematosis
C: Blalock-Taussig shunt
Answer: C: Blalock-Taussig shunt 
Explanation: .