Find the wrong pair. List I List II a. Hasanpur Sugar b. Dumraon Cotton textile c. Bhagalpur Petrochemicals d. Obra Woollen clothes

The correct answer is D. Obra Woollen clothes.

List I contains the names of places in Bihar, India, while List II contains the names of products that are not typically associated with those places. For example, Hasanpur is a town in the Buxar district of Bihar, and it is known for its sugar production. Dumraon is a town in the Rohtas district of Bihar, and it is known for its cotton textile industry. Bhagalpur is a city in the Bhagalpur district of Bihar, and it is known for its petrochemicals industry. However, Obra is a town in the Rohtas district of Bihar, and it is not known for its woollen clothes industry.