In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: ADH increases the osmolality of the renal interstitial medium because it increases:
Options: <1> The permeability to urea in the collector tube. <2> The water permeability of the ascending loop of Henle. <3> The flow in the straight vessels. <4> The reabsorption of NaCl in the collecting tubule. <5> The renal excretion of water.
1