PARTS OF THE TESTIS: Answer a. lobules b. medulla c. cortex d. mediastinum e. tunics

The correct answer is a. lobules.<br /><br />The testis is composed of several lobules, which are small compartments containing seminiferous tubules where sperm production occurs. The other options listed are not parts of the testis. The medulla is a part of the adrenal gland, the cortex is the outer layer of an organ, the mediastinum is a central compartment in the thoracic cavity, and tunics refer to the layers of tissue that cover organs.