Concept:This question tests your knowledge of major fairs in India, especially the largest cattle fair in Asia. Explanation:Asia's largest cattle fair is the Sonepur Cattle Fair. It is held in Sonepur, Bihar, on Kartik Poornima (full moon) in November-December. The fair takes place at the confluence of the Ganges and Gandak rivers. It is also known as Harihar Kshetra Mela. The fair covers 500 acres and has been a centre for cattle trading for centuries. Other options: Haridwar and Nashik are famous for the Kumbh Mela (largest human congregation). Pushkar is known for the Pushkar Camel Mela, not the largest cattle fair. Answer:C. Sonepur