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
Antibiotic that achieves high concentration in Hard tissue, because of its molecular size is 
Select and explain. 
A. Ceftum, B. Ciprofloxacin, C. Clindamycin, D. Erythromycin
C: Clindamycin
Answer: C: Clindamycin 
Explanation: None