The term "Gulf Stream" generally refers to a warm ocean current in the Atlantic Ocean, not a cold current. Among the options you listed, the Oyashio Current is a cold current. The other currents mentioned are:
- Brazil Current: A warm ocean current that flows south along the Brazilian coast.
- Gulf Stream: A warm and swift Atlantic ocean current originating in the Gulf of Mexico.
So, in summary, the Oyashio Current is the cold current in your list.