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
Failure of Hertwig's epithelial sheath diaphragm to investigate the proper horizontal level leads to: 
Select and explain. 
A. Taurodontism., B. Dentin dysplasia., C. Pulp polyp., D. Amelogenesis imperfecta.
A: Taurodontism.
Answer: A: Taurodontism. 
Explanation: TAURODONTISM

Also called Bull-like teeth.
Originally described by Sir Arthur Keith in 1913 to describe a condition in which the body of the tooth is enlarged at the expense of roots.
Caused by the failure of Hertwig’s epithelial sheath diaphragm to investigate the proper horizontal level.