The following are multiple choice questions (with answers) about medical knowledge.   **Question:** DOPA and 5 - Hydroxytryptophan are clinically important because   (A) They cross Blood Brain Barriers   (B) They are acidic precursors of Brain amines   (C) They act as neuromodulators   (D) They are metabolites of various neurogenic amines
['(A) They cross Blood Brain Barriers <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) They cross Blood Brain Barriers \n (B) They are acidic precursors of Brain amines \n (C) They act as neuromodulators \n (D) They are metabolites of various neurogenic amines <> possible answers', '  DOPA and 5 - Hydroxytryptophan are clinically\nimportant because <> context@']