This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Consider the following modalities of treatment 1. Balloon dilatation 2. Heller&;s operation 3. Local injection of botulinum toxin Which of the above is/are the treatment modalities for achalasia cardia? 
Select and explain. 
A. 1 only, B. 1 and 2 only, C. 2 and 3 only, D. ) 1, 2 and 3
D: ) 1, 2 and 3
Answer: D: ) 1, 2 and 3 
Explanation: <p>Davidson&;s principles and practice of medicine 22nd edition. *endoscopically directed injection of botulinum toxin into the lower oesophageal sphincter induces clinical remission but relapse is common. *Surgical myotomy or Heller&;s operation performed eitheeither laproscopically or as an open operation is effective. *Balloon catheter dialatatin improves symptoms in 80% cases</p>