Explanation: The Andaman and Nicobar Islands are a union territory of India, located in the Bay of Bengal. The archipelago is divided into two main groups: the Andaman group and the Nicobar group. The Nicobar group of islands is located to the south of the Andaman group and consists of several islands, including Great Nicobar, Little Nicobar, Katchal, Nancowry, and others.
Great Nicobar is the largest island in the Nicobar group, covering an area of approximately 1,042 square kilometers. It is located at the southernmost tip of the Nicobar group and is known for its rich biodiversity, including unique flora and fauna. The island is home to several indigenous communities, including the Shompen and Nicobarese tribes.
The other islands mentioned in the options are not part of the Nicobar group or are not the largest island in the group. Middle Andaman and Ross Island are part of the Andaman group of islands, which is distinct from the Nicobar group. Pilomillow Island, while part of the Nicobar group, is much smaller than Great Nicobar and does not match the criteria of being the largest island in the Nicobar group.
Understanding the geographical layout and the sizes of the islands in the Andaman and Nicobar archipelago is crucial for comprehending the unique features and administrative divisions of this union territory. The Nicobar group, with Great Nicobar as its largest island, plays a significant role in the ecological and cultural landscape of the Andaman and Nicobar Islands.