A 38yrs lady presents with fever for 3 weeks.On examination she is observed to have Splenomegaly. Ultrasonography reveals a hypoechoic shadow in spleen near the hilum. Gram negative bacilli are isolated on blood culture.The most Possible causative organism is-

• A. Toxoplasmosis
• B. Cytomegalovirus
• C. Lymphoma virus
• D. Salmonella