Final answer:
The blood test that checks for bacterial growth is the culture and sensitivity test, which identifies the bacteria and their antibiotic sensitivity. The correct answer is B).
Step-by-step explanation:
The blood test that checks for bacterial growth is B. culture and sensitivity. This test involves placing a sample of blood on a culture medium under conditions that allow bacteria to grow if they are present. It's used to identify the specific bacteria causing an infection and to determine which antibiotics are effective against them. Other tests mentioned, such as erythrocyte sedimentation rate and hematocrit, assess inflammation and determine the proportion of red blood cells in the blood, respectively, while pro-time measures how long it takes blood to clot.