Let's analyze the question which asks for the author of the debut novel 'The Last Song of Dusk'. Identifying the author of a specific book, especially a debut novel, requires knowledge of literature and authors.

Identifying the Author of 'The Last Song of Dusk'

'The Last Song of Dusk' is a well-known novel. To find its author, we need to consider the options provided and recall or research which author is associated with this specific work as their debut novel.

• Ravinder Singh is known for popular romance novels like 'I Too Had a Love Story'.
• Ira Trivedi is an author and yoga teacher, known for books like 'What Would You Do to Save the World?' and 'India in Love'.
• Nikita Singh is another popular romance novelist, author of books like 'Love @ Facebook'.
• Siddharth Dhanvant Shanghvi is an author whose work includes 'The Last Song of Dusk' and 'Sacred Games' (a collection of stories).

Researching the literary works of these authors confirms that 'The Last Song of Dusk' was indeed the debut novel by Siddharth Dhanvant Shanghvi, published in 2004.

Analyzing the Options for 'The Last Song of Dusk' Author

Based on this analysis, Siddharth Dhanvant Shanghvi is the author whose debut novel is 'The Last Song of Dusk'.

Conclusion on 'The Last Song of Dusk' Author

Therefore, the correct answer is Siddharth Dhanvant Shanghvi.

Revision Table: Indian Authors and Debut Novels

Additional Information: About 'The Last Song of Dusk'

'The Last Song of Dusk' is a critically acclaimed novel. It is known for its lyrical prose and exploration of themes like love, loss, and memory within a rich Indian setting. The book received several awards, including the Betty Trask Award, and was translated into multiple languages, establishing Siddharth Dhanvant Shanghvi as a significant voice in contemporary Indian literature from his very first book.