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
Which among the following drug is not used in the
treatment of Tetralogy of Fallot? 
Select and explain. 
A. β blocker, B. α agonists, C. Calcium channel blockers, D. Morphine
C: Calcium channel blockers
Answer: C: Calcium channel blockers 
Explanation: Calcium channel blockers reduce systemic Vascular resistance which incsceases blood flow into Aorta and decreases blood to pulmonary vasculature. This adds to the pathology and worsens the condition.