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
Blalock and Taussig shunt is done between: 
Select and explain. 
A. Aoa to pulmonary aery, B. Aoa to pulmonary vein, C. Subclan aery to pulmonary aery, D. Subclan vien to aery
C: Subclan aery to pulmonary aery
Answer: C: Subclan aery to pulmonary aery 
Explanation: Blalock Taussig shunt is done between subclan aery and pulmonary aery. It is a palliative surgical procedure done in patients with TOF. In this procedure, a systemic aery is anastomosed with pulmonary aery, which inturn increase the pulmonary blood flow and increase the amount of oxygenated blood reaching the systemic circulation. Ref: Essential Pediatrics, 6th Edition By O P Ghai, Page 409.