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
A 6 year old female child reported with a chief complaint of proclined upper anteriors. Parents give a history of prolonged bottle-feeding and a persistent thumb sucking habit. Clinical examination reveals anterior open bite with proclined upper anterior and retroclined lower anterior teeth and associated tongue thrusting.
In thumb sucking, protraction of the maxillary teeth is seen: 
Select and explain. 
A. When the pollex is held upward against the palate, B. When the pollex is held downward against the tongue, C. When the pollex is held inward against the cheek, D. None of the above
A: When the pollex is held upward against the palate
Answer: A: When the pollex is held upward against the palate 
Explanation: None