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
The yellowish white soft sticky deposit loosely adherent
present on tooth surface is 
Select and explain. 
A. Materia alba, B. Food debris, C. Plaque, D. Calculus
A: Materia alba
Answer: A: Materia alba 
Explanation: None