40. Gout is caused by high levels of uric acid. What are the possible causes?
(A) Glucose-6-phosphatase deficiency
(B) Phosphoribosylpyrophosphate (PRPP) synthetase mutation
(C) Hypoxanthine-guanine phosophoribosyItransferase (HGPRT) deficiency
(D) All of these are possible causes.
(E) None of the above.
答案：99
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中