Final answer:
The correct answer is Physical dependency is when the body acquires a chemical need for a substance, leading to withdrawal symptoms upon cessation of use.
Step-by-step explanation:
The condition in which the body acquires a chemical need for a substance is called physical dependency. This involves changes in normal bodily functions, and the user will experience withdrawal symptoms upon cessation of use.
In contrast, psychological dependency refers to an emotional need for the drug to relieve psychological distress when the body acquires a chemical need for a substance, leading to withdrawal symptoms upon cessation of use.