Which medication is indicated for prophylaxis against malaria?

Chloroquine is indeed indicated for the prophylaxis against malaria, making it the correct choice. This medication has been widely used to prevent and treat malaria, as it functions by interfering with the growth of the malaria parasite in the red blood cells. It is particularly effective in areas where the malaria-causing parasites remain sensitive to chloroquine.

Palivizumab is designed for the prevention of respiratory syncytial virus (RSV) infections in high-risk infants and has no role in malaria prophylaxis. Ritonavir and Dasabuvir are antiviral medications used primarily for the treatment of HIV and hepatitis C, respectively, and do not have any indication for malaria prevention. Therefore, among the given options, chloroquine is the only drug with a specific role in malaria prophylaxis, solidifying its status as the correct answer.