This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': 'Delayed puberty is when primary amenorrhea is seen without development of secondary sexual characters beyond the age of? \nSelect and explain. \nA. 12 years, B. 14 years, C. 16 years, D. 18 years', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. 16 years(Ref: Nelson's 20/e p 2673, Ghai 8/e p 534)Delayed puberty is defined as absence of secondary sexual characters by 14 yrs age or absence of menarche by 16 years.", 'role': 'assistant'}]