A 62-year-old man is admitted with to the cardiology ward with infective endocarditis. Blood cultures grow Streptococcus bovis.. Colonoscopy

A 62-year-old man is admitted with to the cardiology ward with infective endocarditis. Blood cultures grow Streptococcus bovis . What is the most appropriate investigation given the blood culture findings?
A. Small bowel meal
B. Bronchoscopy
C. Cystoscopy
D. Gastroscopy
E. Colonoscopy***