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
Vertical wrinkles of upper lip in CD patient is might be result of? 
Select and explain. 
A. Lack of proper lip support, B. Lack of lip fullness, C. Maxillary anterior teeth set labially, D. Any of above
A: Lack of proper lip support
Answer: A: Lack of proper lip support 
Explanation: Proper lip support leads to normal lip appearance so Lack of proper lip support due to absence of anterior teeth or too far palatally placed anterior leads to appearance of vertical wrinkles on lip.