The Ovary releases an egg each month which enters the Fallopian tubes and then goes to the uterus.
A hazardous material is any item or agent ( it can be biological, chemical, radioactive, and any sort of physical object ), that has the potential of harming any biological creature or the environment (by biological we mean humans, animals etc.)
Any substance that is a health hazard is a hazardous material. Here are some examples : chemicals with carcinogents, toxic agents, sensitizers etc.
The answer is "B" because it's used to help a strain ankle and other things.