Blockage of a blood vessel caused by thrombosis or clot formation.

• A. Embolism
• B. Hemorrhage
• C. Thrombotic Occlusion
• D. Aneurysm

Answer: (C)

Blockage caused by a clot forming in its place is described as thrombotic occlusion. A thrombus is a clot that develops within a vessel and can grow until it blocks the flow of blood at that spot. This is different from an embolism, where a clot or other material travels from somewhere else and lodges in a vessel, causing blockage there. It’s also distinct from hemorrhage, which is bleeding outside or into tissues, and from an aneurysm, which is a ballooning or dilation of a vessel that can distort or rupture but isn’t a clot causing occlusion. So when the obstruction results from a clot that forms at the site, the correct term is thrombotic occlusion.