Which of the following is NOT TRUE, according to the passage?
A.Before the dexamethasone research, hospitals had to give other drugs to COVID-19 patients.
B.Many health experts in the US still remain doubtful of the dexamethasone research's findings.
C.Dexamethasone is a type of steroid that is cheap and readily available in many pharmacies.
D.Researchers found that dexamethasone can reduce mortality in severely ill COVID-19 patients.