A mature mammalian sperm cell consists of four parts: Head, Neck, Middle piece and Tail. 1. Head contains the nucleus having haploid number of chromosomes and an acrosome which contains the hydrolytic enzymes. 2. Neck contains a pair of centrioles lying at right angle to each other. 3. Middle piece is enlarged by the presence of many mitochondrion arranged in spiral turns around the axial filament (that contains centrioles) called mitochondrial spiral. Energy for movement of sperm is provided by mitochondria. 4. Tail is composed of cytoplasm and axoneme occurs throughout it. Hence, middle piece of mammalian sperm possess mitochondria and centriole. So, the correct answer is 'Mitochondria and centriole'.