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: Radiology
All the following are causes of secondary achalasia except 
Select and explain. 
A. Allgrove's Syndrome, B. Multiple endocrine neoplasia, C. Kala azar, D. Chaga's disease
C: Kala azar
Answer: C: Kala azar 
Explanation: Causes of Secondary achalasia:

Triple 'A' or Allgrove's Syndrome
MEN
Chaga's disease
Cancer Invading LES.