This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
A patient presents with fever for 3 weeks. On examination, he is observed to have splenomegaly. Ultrasonography reveals a hypoechoic shadow in spleen near the hilum. Gram-negative bacilli are isolated on blood culture. Which of the following is the most likely causative organism 
Select and explain. 
A. Cytomegalovirus, B. Toxoplasmosis, C. Salmonella, D. Lymphoma virus
C: Salmonella
Answer: C: Salmonella 
Explanation: A hypoechoic mass seen in hilum is a splenic abscess which is due to the infected splenic embolus or in association with typhoid or paratyphoid fever which is caused by Salmonella typhi. Bailey and love&;s 24 th edition pg no.1088