Answer:
The correct answer is B. only protein coding regions contain homologs in other organism.
Explanation:
Annotation of genome is process related to bioinformatics that helps to determine the both location and function of protein coding region within a genome.
when two proteins share similar sequence in two different organism,then these two proteins are called homologs.
Coding regions basically contain homologs or identical sequence in other organism which helps to comparison between coding and non coding genes and this ultimately helps identify protein coding genes from non coding RNAs.