Identify the type of data structure used in the given example
The patient records are organized in a hierarchical structure, with the top level containing different medical specialties and sublevels containing treatments and operations associated with each specialty.
The type of data structure used in the given example is a Tree.
Complete the following task based on the instruction and optional input provided.### Instruction:
Identify the type of data structure used in the given example

### Input:
The patient records are organized in a hierarchical structure, with the top level containing different medical specialties and sublevels containing treatments and operations associated with each specialty.

### Output:
The type of data structure used in the given example is a Tree.