input: 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. On investigation, the Guthrie test was found to be positive.All are true regarding this disease except?   (A) Due to Phenylalanine hydroxylase enzyme defect   (B) White patch of hair due to tryptophan deficiency   (C) Phenyl acetate positive in urine   (D) Mental retardation is present
output: ['(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 Phenylalanine hydroxylase enzyme defect  (B) White patch of hair due to tryptophan deficiency  (C) Phenyl acetate positive in urine  (D) Mental retardation is present <> possible answers', '  An infant presented to the OPD with a history of vomiting and malnutrition. On investigation, the Guthrie test was found to be positive.All are true regarding this disease except? <> context']