This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pubey and Adolescent Health, Subject name: Pediatrics
Menarche usually occurs how much time after thelarche? 
Select and explain. 
A. 1 year, B. 2 years, C. 6 months, D. 4 years
B: 2 years
Answer: B: 2 years 
Explanation: Menarche usually occurs 2-2.5 years after thelarche.