Concept:This question tests knowledge of famous Indian authors and their notable literary works.Explanation:The novel ‘An Equal Music’ (1999) is a romantic story about classical musicians in London. It is written by Vikram Seth, a renowned Indian author. Among the given options, only Vikram Seth has written this book. The other authors are known for different works: Kiran Desai for ‘The Inheritance of Loss’, Zulfikar Ghose for ‘The Murder of Aziz Khan’, and Shiva Naipaul for ‘Fireflies’.Answer:A. Vikram Seth