question: Q:An infant boy of unknown age and medical history is dropped off in the emergency department. The infant appears lethargic and has a large protruding tongue. Although the infant exhibits signs of neglect, he is in no apparent distress. The heart rate is 70/min, the respiratory rate is 30/min, and the temperature is 35.7°C (96.2°F). Which of the following is the most likely cause of the patient’s physical exam findings?? 
  {'A': 'Mutation in the WT2 gene', 'B': 'Congenital agenesis of an endocrine gland in the anterior neck', 'C': 'Excess growth hormone secondary to pituitary gland tumor', 'D': 'Type I hypersensitivity reaction', 'E': 'Autosomal dominant mutation in the SERPING1 gene'},