With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Narrows stars Sophia Bush in her film debut.
text_B: Infective endocarditis is a form of endocarditis .. endocarditis. endocarditis. It is an inflammation of the inner tissues of the heart , the endocardium , usually of the valves .. inflammation. inflammation. endocardium. endocardium. valves. heart valve. It is caused by infectious agents , or pathogens , which are largely bacterial but a few other organisms can also be responsible .. Before the age of modern antibiotics it was almost universally fatal .. The valves of the heart do not receive any dedicated blood supply .. valves. heart valve. valves of the heart. heart valve. As a result , defensive immune system mechanisms -LRB- such as white blood cells -RRB- can not directly reach the valves via the bloodstream .. valves. heart valve. immune system. immune system. If an organism -LRB- such as bacteria -RRB- attaches to a valve surface and forms a vegetation , the host 's immune response is blunted .. bacteria. bacterium. vegetation. Vegetation ( pathology ). The lack of blood supply to the valves also has implications for treatment , since drugs also have difficulty reaching the infected area .. valves. heart valve. Normally , blood flows smoothly through these valves .. valves. heart valve. If they have been damaged -- from rheumatic fever , for example -- the risk of bacterial attachment is increased .. rheumatic fever. rheumatic fever
not_related.