This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
Most common type of hiatus hernia: 
Select and explain. 
A. Sliding, B. Rolling, C. Mixed, D. None
A: Sliding
Answer: A: Sliding 
Explanation: Ans. (a) SlidingRef: Bailey and Love 27h Edition, Page 1083Sliding hiatus hernia in which OG junction enters the mediastinum via the wide hiatus,* Type 1: Sliding (Most common--70%)* Type 2: Paraesophageal/Rolling hernia* Type 3: Mixed* Type 4: Along with stomach, other structures like colon, spleen, pancreas or small bowel migrate into mediastinum.