All the following statements about obstructive jaundice are true except?

(A) Prothrombin time may be prolonged due to
impaired absorption of vitamin K
(B) Serum alkaline phosphatase may be raised
due to increased release of the enzyme from
liver cells
(C) Bile salts may enter systemic circulation due
to biliary obstruction
(D) There is no defect in conjugation of bilirubin