<prompt> 30 yrs old farmer treated initially with chloroquine for uncomplicated malaria now has an episode of relapse, what could be the reason for relapse?P. vivax has a significant level of chloroquine resistance.P. vivax has a persistent exoerythrocytic stage hypnozoite.P. vivax has a persistent erythrocytic stage.Chloroquine is not one of the drugs of choice.  <response>: Both Plasmodium ovale and Plasmodium vivax may have resting liver forms, which are very slow to develop into schizonts with merozoites and proceed onto the chloroquine-sensitive erythrocytic stages after treatment is over. 