What is the current consensus regarding the use of hydroxychloroquine for improving survival rates in coronavirus (COVID-19) patients?
a. Hydroxychloroquine has been shown to significantly improve survival rates and is widely recommended for COVID-19 treatment.
b. Hydroxychloroquine has been found to have no significant effect on survival rates and is not recommended for COVID-19 treatment.
c. Hydroxychloroquine has been proven to be effective in combination with other treatments for improving survival rates.
d. Hydroxychloroquine is recommended only for specific cases with severe symptoms of COVID-19.