Which of the following tumors is classified as benign?

The classification of a tumor as benign means that it is non-cancerous and does not spread to other parts of the body. Fibromas are tumors made up of fibrous or connective tissue and are generally regarded as benign. They typically grow slowly and have well-defined borders, which makes them less concerning in terms of invasiveness or potential to metastasize. Although they can cause issues depending on their location, they are not associated with the aggressive characteristics seen in malignant tumors.

In contrast, meningiomas, although often classified as benign, can exhibit aggressive behavior depending on their type and location, which complicates their classification. Adenocarcinomas and melanomas, on the other hand, are both classified as malignant. Adenocarcinomas arise from glandular tissue and have the potential to invade surrounding tissues and metastasize. Melanomas are a serious form of skin cancer that arises from melanocytes, the pigment-producing cells of the skin, and are known for their aggressive nature. Consequently, these tumors do not fit the benign classification that characterizes fibromas.