Among the following hydrogen vehicle drivers, who must take special training under high-pressure gas safety law?

Answer: ② Drivers of large hydrogen buses (36 or more seats)

Special gas-safety training is required for drivers of large hydrogen buses, which carry large amounts of high-pressure hydrogen. Drivers of hydrogen passenger cars, trucks and special vehicles are not covered by this requirement. [Enforcement Rule of the High-Pressure Gas Safety Control Act, Art. 51(1), Annex 31]