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
Ectodermal cells in tooth bud are responsible for 
Select and explain. 
A. Determination of shape of crown and root, B. Formation of periodontal ligament, C. Formation of cementum, D. Formation of pulp
A: Determination of shape of crown and root
Answer: A: Determination of shape of crown and root 
Explanation: None