The following are multiple choice questions (with answers) about medical knowledge.   **Question:** An infant presented to the OPD with a history of vomiting and malnutrition. Patient has blue eyes, blonde hair & fair skin. On investigation, Guthrie test was found to be positive. All are true regarding this disease EXCEPT:   (A) Due to PAH enzyme defect   (B) White patch of hair due to tryptophan deficiency   (C) Phenyl acetate positive in urine   (D) Mental retardation is present
['(B) White patch of hair due to tryptophan deficiency <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Due to PAH enzyme defect \n (B) White patch of hair due to tryptophan deficiency \n (C) Phenyl acetate positive in urine \n (D) Mental retardation is present <> possible answers', '  An infant presented to the OPD with a history of vomiting and malnutrition. Patient has blue eyes, blonde hair & fair skin. On investigation, Guthrie test was found to be positive. All are true regarding this disease EXCEPT: <> context@']