The correct answer is Option (4)-Thymine
There are two types of nitrogenous bases – Purines (Adenine and Guanine), and Pyrimidines (Cytosine, Uracil and Thymine). Cytosine is common for both DNA and RNA and Thymine is present in DNA. Uracil is present in RNA at the place of Thymine.
So, the nitrogenous base that is NOT present in RNA is Thymine (T). Thymine is found in DNA but not in RNA. Instead, RNA uses Uracil (U) as its equivalent base to pair with Adenine (A).
