42. Visual problems in MS are fundamentally caused by which of the following factors?
(A) Frigid temperatures.
(B) Wound infection.
(C) Damaged nerves.
(D) None of the above.
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統計: A(11), B(9), C(330), D(21), E(0) #3089130
統計: A(11), B(9), C(330), D(21), E(0) #3089130