Answer:
Human papilloma virus.
Explanation:
STDs are sexually transmitted disease that are more often transferred through the sexual contact. They are the common contagious disease that affects the human population.
Genital warts are marked by the pink or brown swellings near the genital area. They can occur on any reproductive part of the body. The causative agent of the warts is the human papilloma virus and can be converted into cancer if left untreated.
Thus, the answer is human papilloma virus.