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
All ceramic crowns are not indicated for young children because of: 
Select and explain. 
A. Short clinical crown height, B. Root formation is not completed, C. Pulp horns are wide and high, D. Maintenance of oral hygiene is difficult
C: Pulp horns are wide and high
Answer: C: Pulp horns are wide and high 
Explanation: None