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: Pharmacology
Which one of the following antibiotics chelates with calcium ? 
Select and explain. 
A. Penicillin, B. Tetracycline, C. Cephalosporins, D. Erythromycin
B: Tetracycline
Answer: B: Tetracycline 
Explanation: None