Question: karachi is the largest city in the world

Answer: No, Karachi (Urdu: کراچی‎; ALA-LC: Karācī, IPA: (kəˈraːˌtʃi) ( listen); Sindhi: ڪراچي‎) is the capital of the Pakistani province of Sindh. It is the most populous city in Pakistan, sixth most populous city proper in the world and the 8th most populous metropolitan city in the world. Ranked as a beta world city, the city is Pakistan's premier industrial and financial centre. Karachi is also Pakistan's most cosmopolitan city. Situated on the Arabian Sea, Karachi serves as a transport hub, and is home to two of Pakistan's two largest seaports, the Port of Karachi and Port Bin Qasim, as well as the busiest airport in Pakistan.