The correct option is
A Uriniferous tubule
The nephrons along with collecting ducts are called as uriniferous tubule. The nephron is the structural and functional unit of the kidney. The body of the nephron is divided into Renal corpuscle, PCT, a loop of Henle and DCT. Hence Loop of Henle is part of 'Uriniferous tubule'.So, the correct answer is 'Uriniferous tubule'.