The state animal of Tamil Nadu is the:

The correct answer is: b) Lion-tailed Macaque.

The Lion-tailed Macaque is a species of macaque native to the Western Ghats of India. It is the state animal of Tamil Nadu. It is a medium-sized monkey with a long, shaggy tail. The fur is black with a golden mane around the head and neck. The Lion-tailed Macaque is an arboreal species and spends most of its time in trees. It is a social animal and lives in groups of up to 30 individuals. The diet of the Lion-tailed Macaque consists of fruits, leaves, flowers, insects, and small mammals.

The other options are incorrect for the following reasons:

• The Nilgiri Tahr is a species of wild goat native to the Western Ghats of India. It is not the state animal of Tamil Nadu.
• The Indian Elephant is the largest land mammal in the world. It is found in India, Sri Lanka, Nepal, Bhutan, and Bangladesh. It is not the state animal of Tamil Nadu.
• The Tiger is a large cat native to Asia. It is the national animal of India. It is not the state animal of Tamil Nadu.