Choledochal cyst and malignancy

Q) Choledochal cyst  and malignancy false statement is  (AIIMS 2018 nov)

a) Highest malignancy in Type 3

b) Malignancy can occur even after removal of choledochal cyst

c) Malignancy can occur anywhere in the biliary tract

d) It can take upto 15 years for malignancy to develop after excision of choledochal cyst

Answer