The correct option is A IUDs increase phagocytosis reaction in the uterus
Introduction to IUDs:
Intra Uterine Devices (IUDs) are devices which are available in various shapes and are inserted in the uterus. Examples include Cu T, Cu 7 etc.
IUDs are generally inserted by the user herself:
IUDs should be placed correctly and at the right location in the female reproductive tract for its effect. It can be done only by a practiced and qualified doctor or nurse. It should not be done by the user.
If IUDs are placed incorrectly, it could lead to health complications. Hence, it is not a correct statement about IUDs.
IUDs increase phagocytosis reaction in the uterus:
IUDs work either by increasing the phagocytosis of sperms or by suppressing the sperm motility. Therefore, it is a correct statement about IUDs.
IUDs suppress gametogenesis:
IUDs do not suppress gametogenesis. They suppress sperm motility to prevent fertilisation of gametes. Hence, it is an incorrect statement about IUDs.
IUDs once inserted need not be replaced:
IUDs such as copper releasing IUDs are effective only for a certain time period. Therefore, they need to be replaced periodically. Thus, the given statement is incorrect.
Final answer: b. IUDs increase phagocytosis reaction in the uterus