Final answer:
Group A-selective strep agar with 5 is used to select for Group A streptococci, which are pathogenic bacteria that can cause human diseases.
Step-by-step explanation:
The purpose of Group A-selective strep agar with 5 is to select for Group A streptococci. Group A streptococci, such as Streptococcus pyogenes, are pathogenic bacteria that can cause various human diseases. The agar is designed to promote the growth and identification of Group A streptococci by providing specific nutrients and conditions that favor their growth.