This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pharmacology
Which of the following is a soft steroid useful in asthma? 
Select and explain. 
A. Dexamethasone, B. Betamethasone, C. Ciclesonide, D. Hydrocoisone
C: Ciclesonide
Answer: C: Ciclesonide 
Explanation: Ciclesonide Inhaled coicosteroid. It is a prodrug which is metabolized to active compound by enzymes in the lungs. Thus, it has least risk of toxicity from systemic absorption when given by inhalational route. It is known as soft steroid.