What can drive with b license?

In which country? Your use of 'licence' rather than 'license' leads me to believe you're not in the US, so one would need to know your country of residence before this could be answered.

If that was a typo, and you are in the US, then you need to indicate which type of "B" licence you had in mind - CDL, or non-CDL (if you're in a state which has such a system in place).

For a Class B CDL, it allows you to operate:

• Single vehicles with a Gross Combination Weight Rating in excess of 26,000 lbs.
• Combinations with a Gross Combination Weight Rating in excess of 26,000 lbs., provided the Gross Vehicle Weight Rating of the vehicle in tow is not in excess of 10,000 lbs.