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 salivary factor is not bactericidal? 
Select and explain. 
A. Ca2+ and Po42-, B. Lysozymes, C. Ig A, D. Lectoperoxidase
A: Ca2+ and Po42-
Answer: A: Ca2+ and Po42- 
Explanation: None