Molecule ' X ' contains a sugar attached to a nitrogen base. Phosphate group is also esterified to the sugar. What is molecule X? Identify the correct set of organic molecules belonging to this category.
a) Nucleoside : Adenosine, Uridine
b) Nucleotide : Uridylic acid, Cytidylic acid
c) Nucleic acid : RNA, DNA
d) Phospholipid : Lecithin, Cephalin
