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 abnormal swallowing pattern with the poorest prognosis is: 
Select and explain. 
A. Simple tongue thrust, B. Complex tongue thrust, C. Infantile swallow, D. Retained infantile swallow
D: Retained infantile swallow
Answer: D: Retained infantile swallow 
Explanation: None