Using the figure shown below, identify the star with the smallest radius. 
Definitions:
Mucous Membrane
The moist tissue lining certain internal organs and body cavities, producing mucus to protect and lubricate surfaces.
Peptic Ulcer Disease
A condition where open sores develop on the inside lining of the stomach, upper small intestine, or esophagus, often due to inflammation caused by the bacteria H. pylori, as well as from erosion from stomach acids.
Twisting
The act of winding or rotating around something, could apply to body movements, objects, or materials.
Obstruction
A blockage or impeding condition that can occur in bodily structures, affecting normal flow or function.
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