TASK DEFINITION: Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
PROBLEM: child development refers to biological, psychological and emotional changes that happen in humans between birth and the end of adolescence, at which time the individual goes from dependence to independence.

SOLUTION: child development

PROBLEM: hiragana are part of the japanese writing system.

SOLUTION: hiragana

PROBLEM: total depravity (also called total inability or total corruption) is a theological teaching that comes from augustine's teachings on original sin.

SOLUTION:
total depravity