Statement: Some strains of mosquito have become resistant to chloroquine - the widely used medicine for malaria patients.
Courses of Action:
1. Selling of chloroquine should be stopped.
2. Researchers should develop a new medicine for patients affected by such mosquitoes.
3. All the patients suffering from malaria should be checked for identification of causal mosquito.
Answer: D
Clearly, chloroquine can still be used to get rid of the non-resistant varieties, and new medicines developed for the resistant varieties. The patients can then be treated accordingly by performing tests for the causal mosquito. So, only II and III follow.