Correct Option (a) Convoluted tubules
Explanation:
Convoluted tubule is the highly convoluted segments of nephron in the renal labrinth of the kidney. It is made up of the proximal tubule leading from the Bowman's capsule to the descending limb of Henle's loop and the distal tubule leading from the ascending limb of Henle's loop to a collecting tubule.
