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: Medicine
Recurrence rate is highest with which modality of treatment for achalasia cardia - 
Select and explain. 
A. Pneumatic dilatation, B. Botulinum toxin injection, C. Heller's operation, D. Laparoscopic myotomy of sphincter
B: Botulinum toxin injection
Answer: B: Botulinum toxin injection 
Explanation: None