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: Pathology
Underdeveloped maxilla is seen in all except: 
Select and explain. 
A. Cleidocranial dysplasia., B. Treacher collins syndrome., C. Osteogenesis imperfecta., D. Achondroplasia.
B: Treacher collins syndrome.
Answer: B: Treacher collins syndrome. 
Explanation: None