The correct option is A Reproduction
Mehlis gland is also called as shell gland. It is primarily present surrounding the ootype of tapeworm and it is a part of the female reproductive organ. As a part of the female reproductive organ, it has an important role in guiding the ova out towards the passage ending in the uterus of flatworms. So, its secretion lubricates the passage of the uterus through which ova move. So, option A is correct.