Which of the following is less general in characters as compared to genus?

The correct option is A. Species.

1. Every organism can be classified at 7 different levels - kingdom, phylum, class, order, family, genus and species.
   
2. Each level contains organisms with similar/general characteristics. The kingdom is the largest group and very broad.
   
3. Each successive group contains fewer organisms, but the organisms are more similar.
   
4. A genus is composed of multiple species and these species have general characters which are common among them.
   
5. Species is the lowest taxonomic category and are a more exclusive group so the characters are exclusive to that species.