A 68-year-old man is admitted with 3 weeks of abdominal pain, fevers, chills, sweats, and a new systolic murmur. A transthoracic echocardiogram shows mitral valve vegetations, and 3/3 blood cultures...

A 68-year-old man is admitted with 3 weeks of abdominal pain, fevers, chills, sweats, and a new systolic murmur. A transthoracic echocardiogram shows mitral valve vegetations, and 3/3 blood cultures are subsequently positive for Streptococcus bovis. After successfully completing his 4 weeks of IV penicillin treatment, he undergoes a whole-body computed tomography scan to evaluate his 25-pound weight loss.Which of the following tumors is most likely to be found?

A. Thyroid carcinoma

B. Squamous cell lung cancer

C. Adenocarcinoma of the colon

D. Transitional cell carcinoma of the bladder

E. Small cell lung cancer