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
Marie and Sainton's disease is also known as: 
Select and explain. 
A. Dentinogenesis imperfecta., B. Cleidocranial dysostosis., C. Turners hypoplasia., D. Amelogenesia imperfecta.
B: Cleidocranial dysostosis.
Answer: B: Cleidocranial dysostosis. 
Explanation: Important Mainfestations of cleidocranial dysostosis or Marie and Sainton's disease:

Partial or complete absence of clavicles.
Delayed closure of fontanelle.
Wormian bones are common.
The sagittal suture is characteristically sunken, giving the skull a flat appearance.
Hypoplasia of maxilla.
Prolonged retention of deciduous teeth (AP-14) and subsequent delay in eruption of succedaneous teeth.
Absence or paucity of cellular cementum on the roots of the permanent teeth with no increased thickening of the primary acellular cementum.