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
Which of the following type of tongue thrusting has the worst prognosis? 
Select and explain. 
A. Simple, B. Complex, C. Retained infantile swallow, D. All of the above
C: Retained infantile swallow
Answer: C: Retained infantile swallow 
Explanation: Tongue thrusting has been variously described as a deviate swallow, visceral swallow, retained infantile swallow or reverse swallow.
Prognosis

Simple tongue thrusting - Excellent
Complex tongue thrusting - Good
Retained infantile swallow - Poor

Pediatric Dentistry, Principles and Practice / M.S. Muthu, N. Sivakumar - 2nd Ed