The correct answer is option 4, Hyderabad. Hyderabad is known as the ‘Pearl City’. This nickname is derived from the city`s historical association with the trade and cultivation of pearls. For centuries, Hyderabad was a major center for the pearl industry, with pearls being brought from the nearby Gulf of Mannar for processing and trading. The pearls from Hyderabad were renowned for their quality and were highly sought after. Even though the pearl industry is not as prominent today, the city still retains its nickname as a remnant of its glorious past in the pearl trade. Therefore, if you come across a question asking which city is known as the ‘Pearl City’, the correct answer would be Hyderabad.