This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The initial sign of sexual maturity in boys is usually
A) Fat spurt
B) Development of Adam's apple
C) Change in voice
D) Appearance of facial hair 
Select and explain. 
A. BC, B. AC, C. ABC, D. BD
B: AC
Answer: B: AC 
Explanation: None