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
Which of the following factors are primarily contributory to the shedding of deciduous tooth? 
Select and explain. 
A. Hydrostatic, B. Vascular pressure, C. Oncotic pressure, D. Masticatory pressure
D: Masticatory pressure
Answer: D: Masticatory pressure 
Explanation: None