Choose the odd one out of the following set of terms given and name the category to which the others belong:
(i) Phosphate, RNA, Sugar, Nitrogenous base.
(ii) Urethra, uterus, urinary bladder, ureter.
(iii) Cyton, Photon, Axon, Dendron.
(iv) Haemoglobin, glucagon, iodopsin, rhodopsin.
(v) Dendrites, Medullary Sheath, Axon, Spinal cord.

Explanation

Odd one : RNA
Category: Rest are components of a nucleotide whereas RNA is a nucleic acid.