Lysosomes are minute single membrane bound organelle-rich in hydrolytic enzymes which aid in lysis of materials. They aid in fertilization. During fertilization, the sperm releases hydrolytic enzymes from the acrosome vesicles and digest the membrane of the ovum. This degradation triggers the entry of the male nucleus into the ovum and fertilization takes place. Lysosome is also called as autophagy as worn out or defective organelles are digested in the autophagic vesicles or lysosome and they secrete depressors to initiate cell division. Thus, the correct answer is option D.