68. Coagulation is a delicate mechanism controlling clot formation and preventing blood drainage. What kind of dietary deficiency and clotting factor deficiency would lead to defective blood clotting and hemophilia?
(A) vitamin E； factor VII
(B) vitamin B12； factor VIII
(C) vitamin E； von Willebrand factor
(D) vitamin B12； von Willebrand factor
(E) phylloquinone； factor VIII

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統計： A(1), B(11), C(0), D(4), E(32) #3094182