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【单选题】
必需氨基酸是指A.
人体不能合成的氨基酸
B.
人体必须需要的氨基酸
C.
人体内能够自身合成，且能满足人体需要的氨基酸
D.
人体不能合成或合成速度不能满足人体需要，必须从食物中获取的氨基酸
E.
人体内能合成且能满足人体新陈代谢需要，不必从食物中直接获得的氨基酸
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