context: Karachi (,) is Pakistan's largest city and the capital of Sindh. Karachi is the economic hub of Pakistan. The city is located on the shores of the Arabian Sea at the mouth of the Indus River. The metropolitan area is home to some 21.2 million people [1], making it one of the largest cities in the world.
question: Karachi is the capital of which province in Pakistan?
answers.text: Sindh