Which of the following cell organelles is made up of ribosomal RNA and protein?

Correct option is A

The correct answer is (a) Ribosome.
 Rbosomes are the cell organelles responsible for protein synthesis.
 They are composed of ribosomal RNA (rRNA) and proteins in a specific ratio. In fact, rRNA makes up about 60% of the ribosome's mass, while proteins constitute the remaining 40%.
 Ribosomes link amino acids together in the order specified by the codons of messenger RNA molecules to form polypeptide chains.
 A nucleus is a membrane-bound organelle that contains the cell's chromosomes.
 Lysosomes : It is small vesicles containing hydrolytic enzymes and surrounded by a single membrane of up to 100 mm thickness.
 They are formed by Golgi apparatus and contain almost 60 different types of acid hydrolases which help in the digestion of various materials.