One approach that is becoming more common in drug D&D is to search for antimicrobial-producing organisms in relatively pristine environments. A pristine environment is one that has been relatively unperturbed by humans and/or domestic animals. Your D&D team is searching for novel antimicrobials produced by bacteria in a remote area of a temperate rainforest in the Pacific Northwest.
Which of the following terms would accurately describe your drug?

1. antibiotic
2. chemotherapeutic agent
3. natural
4. synthetic
5. semisynthetic