Which statement is true about protein synthesis?
translation produces rna; transcription produces the protein.
dna is translated to produce trna, which assembles proteins.
dna directs the production of mrna; mrna is translated to make trna; trna assembles the protein.
rna directs the production of dna; dna contains genes that produce trna, which builds the protein.

The most probable answer here is the third option from the top, but it not entirely accurate  because mRNA is not translated to make tRNA.  The latter is already present in the cytoplasm of the cell.

The first step in protein synthesis is Transcription in which a new RNA molecule is synthesized from a DNA template. This process takes place in the nucleus of the cell. The new RNA strand is called messenger RNA or simply mRNA because it carries information from the DNA in the nucleus to the site where this information can be Translated from nucleotide language to amino acid language. This site is actually the ribosome/s usually located in the cell cytoplasm. 

The ribosome attaches to the mRNA and begins to read the code on the mRNA.

tRNA which is free in the cytoplasm or attached to the ribosome begins to fetch the correct amino acid coded for by the mRNA  from the amino acid pool in the cytoplasm.

These amino acids are linked together in the ribosome with the help of enzymes to  make a polypeptide chain which is actually the protein, newly formed.

biology is the study of life. it is the study of living organism.