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
Titration of the dose of a drug with the response can be done with which of the following routes of administration: 
Select and explain. 
A. Sublingual, B. Transdermal, C. Inhalational, D. Subcutaneous
C: Inhalational
Answer: C: Inhalational 
Explanation: - Titration of drug dosage can be done only with the inhalational route of administration among the given options.