Correct Answer: a warm ocean current

Solution : The correct answer is a warm ocean current.

El Nino is a weather phenomenon in which cold ocean current in Pacific ocean is replaced by warm ocean currents. Peruvian current is a cold ocean current which flows past the Peruvian coast in eastern Pacific Ocean. During the El Nino event this cold peruvian current shows comparatively warmer water and reversal of the ocean currents and atmospheric cycle occurs. It is associated with the less rainfall events in India and most of the South Asia.