<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-month-old infant is brought to her pediatrician for a well-child visit. The infant was born to a 22-year-old mother via a spontaneous vaginal delivery at 38 weeks of gestation in her home. She moved to the United States approximately 3 weeks ago from a small village. She reports that her infant had 2 episodes of non-bloody and non-bilious vomiting. The infants medical history includes eczema and 2 seizure episodes that resolved with benzodiazepines in the emergency department. Physical examination is notable for a musty body odor, eczema, and a fair skin complexion. Which of the following is the best next step in management?? A: Abdominal radiography, B: Antiepileptic drug, C: Dermatology consult, D: Dietary restriction, E: MRI of the brain,  <response>: This is a clinical vignette about a 3-month-old infant with a history of eczema, seizures, vomiting, and musty body odor on physical exam. The key findings are:- Infant recently moved to the US from a small village - History of eczema and seizures- Physical exam shows musty body odor and fair skinThe musty body odor and fair skin are suggestive of a metabolic disorder like phenylketonuria PKU. PKU is more common in certain ethnic groups and causes a musty odor due to phenylketones in bodily fluids. It is also associated with eczema and seizures. The choices include imaging studies, medications, and dietary changes. However, the next best step would be to test for PKU with a serum phenylalanine level or newborn genetic screening if not done previously. This would confirm the suspected diagnosis.D: Dietary restriction 