Choledochal cyst

Q) False about choledochal cyst is 

a) Type IV is also known as Caroli's disease

b) Type I choledochal cyst is the most common type

c) Type III is also called as choledochocele

d) Type II choledochal cyst is diverticular disease

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This question was asked in NEET this year and a similar question on choledochal cyst is already on the website for some time.

Choledochal cyst