A patient of chronic bronchial asthma was maintained on oral prednisolone 20 mg/day for 3 months. It was decided to switch him over to inhaled beclomethasone dipropionate 200 μg 4 times a day. What should be done to the oral prednisolone medication after starting inhaled beclomethasone:
A. It should be stopped immediately
B. Its dose should be tapered from the next day
C. It should be given at the same dose for one week and then tapered
D. Its dose should be doubled for one week and then tapered