question: Q:A 7-month-old boy is brought to the physician for a well-child examination. He was born at 36 weeks' gestation and has been healthy since. He is at the 60th percentile for length and weight. Vital signs are within normal limits. The abdomen is soft and nontender. The external genitalia appear normal. Examination shows a single palpable testicle in the right hemiscrotum. The scrotum is nontender and not enlarged. There is a palpable mass in the left inguinal canal. Which of the following is the most appropriate next best step in management?? 
  {'A': 'Gondadotropin therapy', 'B': 'Orchidopexy', 'C': 'Exploration under anesthesia', 'D': 'Serum testosterone level', 'E': 'Reassurance'},