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: Surgery
30 years of women comes with dysphagia for both solid & liquids. Barium swallow shows Parrot beak appearance. On esophageal manometry, increased LES pressure. Management includes: 
Select and explain. 
A. Nitrates, B. Ca channel blockers, C. Botulinum toxin, D. All
D: All
Answer: D: All 
Explanation: Ans. is all