<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:Three days after starting a new drug for malaria prophylaxis, a 19-year-old college student comes to the physician because of dark-colored urine and fatigue. He has not had any fever, dysuria, or abdominal pain. He has no history of serious illness. Physical examination shows scleral icterus. Laboratory studies show a hemoglobin of 9.7 gdL and serum lactate dehydrogenase of 234 UL. Peripheral blood smear shows poikilocytes with bite-shaped irregularities. Which of the following drugs has the patient most likely been taking?? A: Pyrimethamine, B: Primaquine, C: Dapsone, D: Ivermectin, E: Doxycycline,  <response>: This is a clinical vignette describing a patient who recently started taking an antimalarial drug and now presents with dark urine, fatigue, scleral icterus, anemia, and bite cells on peripheral smear. The key findings here are:- Recent start of antimalarial prophylaxis- Dark urine and fatigue - suggests hemolytic anemia- Scleral icterus - suggests hyperbilirubinemia from hemolysis- Anemia and bite cells - confirms hemolytic anemiaThis presentation is most consistent with an acute hemolytic anemia caused by primaquine, an antimalarial drug. Primaquine can cause oxidative hemolysis in patients with G6PD deficiency. The other antimalarials - pyrimethamine, dapsone, ivermectin, and doxycycline - do not typically cause this type of acute hemolytic reaction.B: Primaquine 