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 labiodental sounds are 
Select and explain. 
A. f,v,ph, B. s,z,c, C. f,z,s, D. f,v,z
A: f,v,ph
Answer: A: f,v,ph 
Explanation: None