<prompt> A 2-year-old boy is brought in by his mother because of the bloody stool after ingestion of unknown amount of rat poison coumarin based. He is admitted and treated with fresh frozen plasma and vitamin K after his prothrombin time PT was found to be prolonged. What is the reason for bloody stool in this case?Local irritation of bowels because of the ingestion of rodenticideCoumarin is antagonizing vitamin K reductase necessary for production of factors VIII and IXCoumarin is antagonizing vitamin K reductase necessary for production of factors II, VII, IX XCoumarin caused disseminated intravascular coagulation DIC  <response>: Answer: c Coumarin is antagonizing vitamin K reductase necessary for production of factors II, VII, IX and X Vitamin K is necessary for production of factors II, VII, IX, and X. Coumarin will antagonize vitamin K reductase and can result in the bloody stool after poisoning Irritation of bowels is possible, but it wouldnt cause bleeding. DIC is not caused by coumarin based poisons. 