Orange is the fruit of various citrus species in the family Rutaceae (see list of plants known as orange); it primarily refers to Citrus × Sinensis, which is also called sweet orange. Oranges contain D- limonene, a compound that is touted to prevent cancers like lung cancer, skin cancer, and even breast cancer. Vitamin C and antioxidants present in oranges are both important to build the body's immunity – they help in fighting cancer. The fibrous nature of the fruit also makes it cancer-protective.