The correct answer is option 3: Hydrolytic enzymes.

Lysosomes are organelles found in animal cells that contain hydrolytic enzymes. These enzymes are responsible for breaking down various molecules, such as proteins, carbohydrates, and lipids, into smaller components. This process, called hydrolysis, allows cells to recycle old and damaged cellular components, as well as digest external materials taken in by the cell.

The term "suicidal bags" refers to the fact that lysosomes have the ability to break down their own cell if activated under certain conditions. For example, in cells undergoing apoptosis (programmed cell death), lysosomes release their hydrolytic enzymes to break down the cellular components, leading to the death of the cell.

Option 1, "Protolytic enzymes," is incorrect because lysosomal enzymes are hydrolytic, not protolytic. Option 2, "Parasitising nucleus," is unrelated to the function of lysosomes and is incorrect. Option 4, "Phagocytic activity," is incorrect because lysosomes are not involved in phagocytosis (engulfing and digesting particles).