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患者，男性，56岁。患帕金森病用L-dopa治疗，最终每日用到4g，两个月后症状明显好转，为加强营养自行服用多种维生素，其中有VitB 每天50mg，两天后病情明显加重，最可能的原因是A.
VitB 加速L-dopa从肾脏排出
B.
VitB 加速L-dopa的外周代谢
C.
VitB 化学上与L-dopa拮抗
D.
VitB 生理上与L-dopa拮抗
E.
VitB 减少L-dopa中枢脱羧
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