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
Clinical evidence of dentinogenesis imperfecta is 
Select and explain. 
A. Defective enamel and dentine, B. Defective dentine and obliterated pulp chamber, C. Increased rate of caries, D. Oligodontia
B: Defective dentine and obliterated pulp chamber
Answer: B: Defective dentine and obliterated pulp chamber 
Explanation: None