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
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: None