Senescent RBC's are mainly attacked in-: (A) Vivax malaria, (B) Ovale malaria, (C) Falciparum malaria, (D) Quartan malaria
Answer is D. P. malariae which attacks mainly senescent (old) RBC’s: Agent of Quartan malaria
P. ovale and P. vivax: attack younger RBCs and reticulocytes: Agent of benign tertian malaria
P. falciparum: attacks RBC of all ages: Agent of malignant tertian malaria.