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Statement $I:$
The coagulum is formed of network of threads called thrombins.
Statement $II :$
Spleen is the graveyard of erythrocytes.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement $I$: In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.
Statement $II$ : The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.
In the light of the above statements, choose the correct answer from the option given below :