The correct answer is Valmiki National Park.
Valmiki National Park is a national park in the Indian state of Bihar. It is located in the West Champaran district, about 100 km from Patna. The park was established in 1973 to protect the endangered Bengal tiger. It is the largest national park in Bihar and is home to a variety of wildlife, including tigers, leopards, elephants, deer, and birds.
Kanwar Lake Bird Sanctuary is a bird sanctuary in the Indian state of Bihar. It is located in the Kaimur district, about 150 km from Patna. The sanctuary was established in 1982 to protect the migratory birds that visit the lake during the winter. It is home to over 200 species of birds, including flamingos, pelicans, and herons.
Vikramshila Gangetic Dolphin Sanctuary is a sanctuary for the Ganges river dolphin in the Indian state of Bihar. It is located in the Bhagalpur district, about 200 km from Patna. The sanctuary was established in 1991 to protect the endangered Ganges river dolphin. It is home to over 1,000 dolphins.
Udaypur Wildlife Sanctuary is a wildlife sanctuary in the Indian state of Bihar. It is located in the Rohtas district, about 150 km from Patna. The sanctuary was established in 1976 to protect the endangered Bengal tiger. It is home to a variety of wildlife, including tigers, leopards, elephants, deer, and birds.