Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Aircraft | Origin | Role | Registration | Number |
| --- | --- | --- | --- | --- |
| Agusta Bell 206 | Italy | Policing | S5-HPD S5-HPE | 2 |
| Agusta Bell 212 | Italy | Policing | S5-HPB | 1 |
| Agusta Bell 412 | Italy | Policing | S5-HPA | 1 |
| AgustaWestland AW109 | Italy | Policing | S5-HPG S5-HPC | 1 1 |
| Eurocopter EC 135 | European Union | Policing | S5-HPH | 1 |
Question:
What is the role of the aircraft that has a registration of s5-hpb?
Answer:
Policing