Explanation:

- Vikram Seth is known for works like "A Suitable Boy" and "An Equal Music." He is acclaimed for his lyrical and narrative storytelling but is not the author of "Amnesty."

- Amish Tripathi is famous for the "Shiva Trilogy" and "Ram Chandra Series," known for blending mythology with fiction. He is not associated with "Amnesty."

- Shashi Tharoor is a well-known Indian politician and author recognized for his books like "An Era of Darkness" and "The Great Indian Novel." He is unrelated to "Amnesty."

- Aravind Adiga is the correct answer. He authored "Amnesty," a novel dealing with themes of identity and immigration.