question: Q:A 16-year-old teenager presents to the pediatrician with his mother. After she leaves the room he tells the physician that he is worried about puberty. All of his friends have had growth spurts, started building muscle mass, and their voices have changed while he still feels underdeveloped. The physician takes a complete history and performs a thorough physical examination. He goes through the patient’s past medical records and growth charts and notes physical findings documented over the last five years, concluding that the patient has delayed puberty. Which of the following findings supports his conclusion?? 
  {'A': 'The absence of penile enlargement by age of 12 years', 'B': 'The absence of linear growth acceleration by age of 13 years', 'C': 'The absence of testicular enlargement by age of 14 years', 'D': 'Presence of gynecomastia at age of 15 years', 'E': 'The absence of an adult type of pubic hair distribution by age of 16 years'},