What Is the Reason for Injecting Saline Through the Cholangiogram

What is the reason for injecting saline through the cholangiogram catheter prior to the contrast media?

A) The saline will dilute the contrast dye.
B) The saline will dilate the common duct.
C) The saline will push any stones in the cystic duct through.
D) The saline will test patency of the cystic duct prior to injecting the contrast.

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