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
Crack-Nut oesophagus seen in 
Select and explain. 
A. Carcinoma oesophagus, B. Cardiospam, C. Achalasia cardia, D. Barrett's oesophagus
B: Cardiospam
Answer: B: Cardiospam 
Explanation: <P>Davidson's principles and practice of medicine 22nd edition. *crack-nut oesophagus is a condition in which extremely forceful peristaltic activity leads to episodic chest pain and dysphagia.Treatment is with nitrates </p>