Final answer:
Immune infertility refers to the infertility that results from an antigen-antibody reaction in males which leads to the destruction of sperm, affecting fertility by hindering sperm motility or their capacity to fertilize an egg.
Step-by-step explanation:
The best explanation of "immune infertility" is represented by the statement: Antigen-antibody reaction in males causes destruction of sperm, resulting in infertility. This occurs when there is damage to the testes or other parts of the male reproductive tract, potentially leading to the creation of antibodies against a man's own sperm. These anti-sperm antibodies can impair fertility by either killing the sperm or interfering with sperm motility or the ability to fertilize an egg. Immune infertility is not due to sperm enzymes destroying the female ovum nor to an allergy to the female egg, and it is not characterized by a negative reaction post-fertilization but by an immune response that inhibits fertilization from occurring in the first place.