The correct option is A Henle's loop
The proximal tubule, a part of the nephron can be divided into two sections, pars convoluta and pars recta. The pars recta are the following straight (descending) portion. The epithelium of the initial descending segment of the loop of Henle is similar to that of the proximal convoluted tubule and is sometimes called the pars recta of the proximal tubule.