选择题：患儿，男性，3岁。出生后1个月确诊为苯丙酮尿症，四氢生物蝶呤负荷试验示口服四氢生物蝶呤血浆苯丙氨酸浓度下降，经低苯丙氨酸饮食治疗，患儿智力发育正常，本患儿可能有缺陷的酶是

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患儿，男性，3岁。出生后1个月确诊为苯丙酮尿症，四氢生物蝶呤负荷试验示口服四氢生物蝶呤血浆苯丙氨酸浓度下降，经低苯丙氨酸饮食治疗，患儿智力发育正常，本患儿可能有缺陷的酶是

A．苯丙氨酸羟化酶

B．二氢生物蝶呤还原酶

C．丙酮酰四氢蝶呤合成酶

D．酪氨酸羟化酶

E．苯丙氨酸氧化酶




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