Which among the following helps in maintaining the low temperature of the testes ?

Scrotum.

Among the options provided, the structure that helps in maintaining the low temperature of the testes is the scrotum.

The scrotum is a sac-like structure located outside the body, below the penis, containing the testes. Its position outside the body helps regulate the temperature of the testes. The testes need to be maintained at a slightly lower temperature than the rest of the body for the proper production and maturation of sperm. The scrotum helps in maintaining the low temperature of the testes (2–2.5 degree C lower than the normal internal body temperature) necessary for spermatogenesis.