Final answer:
Pubic lice (Option A) is the highly contagious parasitic infection among the choices provided, living in pubic hair and causing itching and irritation.
Step-by-step explanation:
The correct answer to the question of which highly contagious parasitic infection is pubic lice. Option A, pubic lice, are also known as crab louse (Pthirus pubis), and it is a very common sexually transmitted parasite that lives in human pubic hair, bites the skin, and feeds on blood, leading to itching and irritation. On the other hand, Candida albicans, mentioned in option B, is a fungus, not a parasite, and is responsible for yeast infections such as vaginal candidiasis and oral thrush.
Option C, condyloma, refers to genital warts, typically caused by certain types of human papillomavirus (HPV), which are viral, not parasitic infections. Finally, option D, chlamydia, is caused by the bacterium Chlamydia trachomatis and is also not a parasitic but a bacterial infection.