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: Pathology
Normal serum calcium level is 
Select and explain. 
A. 5 to 7 mg%, B. 7 to 9 mg%, C. 9 to 11 mg%, D. 11 to 13 mg%
C: 9 to 11 mg%
Answer: C: 9 to 11 mg% 
Explanation: None