37 下列骨髓化生不良症候群（myelodysplastic syndrome; MDS）各亞型中，何者預後最差？
(A) refractory anemia
(B) refractory anemia with ringed sideroblasts
(C) refractory anemia with excess blasts
(D) MDS with isolated del(5q)

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統計： A(0), B(4), C(11), D(7), E(0) #1067122