Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Nephrons are of two types, cortical and juxtamedullary, based on their relative position in the cortex and medulla.
Reason R: Juxtamedullary nephrons have a short loop of Henle whereas cortical nephrons have a longer loop of Henle.
In the light of the above statements, choose the correct answer from the options given below: