Bordoisila Wildlife Sanctuary is known for its population of:

The correct answer is: a) Pygmy hog.

The Bordoisila Wildlife Sanctuary is a protected area in the Indian state of Assam. It is known for its population of pygmy hogs, which are the smallest wild pigs in the world. Pygmy hogs are shy and nocturnal animals, and they are difficult to spot in the wild. However, they can be seen at the Bordoisila Wildlife Sanctuary, where they are protected from hunting and habitat loss.

The other options are incorrect because:

• Hoolock gibbons are apes that are found in the forests of Southeast Asia. They are not found in the Bordoisila Wildlife Sanctuary.
• Golden langurs are monkeys that are found in the forests of India and Nepal. They are not found in the Bordoisila Wildlife Sanctuary.
• Greater adjutant storks are large storks that are found in the wetlands of Southeast Asia. They are not found in the Bordoisila Wildlife Sanctuary.