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 route of drug administration avoids first pass hepatic metabolism and is used with drug preparation that slowly releases drugs for periods as long as seven days ? 
Select and explain. 
A. Topical, B. Transdermal, C. Sublingual, D. Oral
B: Transdermal
Answer: B: Transdermal 
Explanation: None