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: Surgery
True about Barrett's oesophagus -a) Sequence of prolonged G.E.R.b) It is premalignantc) Lower oesophageal mucosa is replaced by intestinal type of epitheliumd) Varicose veins are seene) Predisposes to squamous cell Ca of esophagus 
Select and explain. 
A. ab, B. bc, C. abc, D. bcd
C: abc
Answer: C: abc 
Explanation: None