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
One of the below mentioned penicillin is NOT given orally: 
Select and explain. 
A. Amoxicillin, B. Carbenicillin, C. Cloxacillin, D. Phenoxymethyl penicillin
B: Carbenicillin
Answer: B: Carbenicillin 
Explanation: None