Question: Aaj Ka Hindustan stars an Indian dancer who is proficient in what style?
Context: Tapan Sinha (2 October 1924 – 15 January 2009) was one of the most prominent Indian film directors of his time forming a legendary quartet with Satyajit Ray, Ritwik Ghatak and Mrinal Sen.  He was primarily a Bengali filmmaker who worked both in Hindi cinema and Bengali cinema, directing films like "Kabuliwala" (1957), "Louha-Kapat", "Sagina Mahato" (1970), "Apanjan" (1968), "Kshudhita Pashan" and children's film "Safed Haathi" (1978) and "Aaj Ka Robinhood".  Sinha started his career in 1946, as a sound engineer with New Theatres film production house in Kolkata, then in 1950 left for England where he worked at Pinewood Studios for next two years, before returning home to start his six decade long career in Indian cinema, making films in Bengali, Hindi and Oriya languages, straddling genres from social realism, family drama, labour rights, to children's fantasy films.  He was arguably the most uncompromising filmmaker outside the orbit of Parallel Cinema. Ravi Mama (Kannada: ರವಿಮಾಮ ) is a 1999 Indian Kannada language romance-drama musical film directed by S. Narayan and produced by S. K. Raju.  The film stars V. Ravichandran and Nagma in the lead roles.  The film is a remake of Hindi blockbuster film "Aaj Ka Arjun" (1990) starring Amitabh Bachchan and Jayaprada in the lead roles which was inturn a remake of Tamil film "En Thangachi Padichava". Balu ABCDEFG is a 2005 Indian Telugu-language action crime film released on 6 January 2005 and was directed by A. Karunakaran.  This film stars Pawan Kalyan, Shriya, and Neha Oberoi.  The film was produced by C. Ashwini Dutt under his production company Vyjayanthi Movies.  Later this film was remade in Dhallywood named Dhakar King starred Shakib Khan and Apu Bishwas.  The film was later dubbed in Hindi as Aaj Ka Gundaraaj. Rajadhani (Kannada: ರಾಜಧಾನಿ ) is a 2011 Indian Kannada film directed by debutante Sowmya Sathyan N. R., starring Yash, Prakash Raj, Chetan Chandra, Sathya It also stars Umashree and Sheena Shahabadi, a Mumbai-based model-turned-actress. .  It was dubbed into Hindi as "Aaj Ka Gangster". Aaj Ka Robin Hood (Translation: Today's robin hood) is a 1988 adventure-drama Indian Hindi film directed and produced by Tapan Sinha.  It starred Anil Chatterjee, Utpal Dutt, Nana Patekar, Rabi Ghosh and Satish Shah in lead roles.  Music for the film was also scored by Tapan Sinha. Jayamala is a Kannada (Indian) film actress.  Her films include "Giri Kanye", "Shankar Guru", "Aaj Ka Ye Ghar", "Sampoorna Teerth Yatraa", "Balak", "Spy in Rome", "Love and Murder" and "Harishchandra Taramati".  She has also produced the film "Aaj Ka Ye Ghar". Aaj Ka Hindustan (Today's Indian) is a 1940 Bollywood film directed by Jayant Desai and starring Rose, Prithviraj Kapoor, Ishwarlal, Sitara Devi and comedian Charlie.  It was produced by Movietone.  The film is the story of two brothers — one a nationalist (Prithviraj) . Gang Leader is a 1991 Indian Telugu crime film starring Chiranjeevi and Vijayashanti directed by Vijaya Bapineedu, with soundtrack by Bappi Lahari, and dance choreography by Prabhu Deva.  The film emerged as a musical blockbuster, cult classic.  It surpassed the box office collections of the blockbuster and industry hit "Jagadeka Veerudu Athiloka Sundari".  Later it was dubbed in Tamil with same title.  The film was later remade in Hindi as "Aaj Ka Goonda Raj" with Chiranjeevi and Meenakshi Seshadri in lead roles, and in Kannada as "Kutumba" starring Upendra. Sitara Devi (8 November 1920 – 25 November 2014) was an eminent Indian dancer of the classical Kathak style of dancing.  Rabindranath Tagore described her as "Nritya Samragini", meaning the empress of dance, after watching her performance when she was just 16 years old.  The epithet continues, and she is still described as the "Kathak queen". Gauriprasanna Mazumder (1924–1986) was an Indian Bengali lyricist.  He is most commonly associated with the black and white era of Bengali cinema, when he penned several enduring classics for the films Anyay Abichar, Maqsad, Tinmurti, Aparupa, Anusandhan, and Aaj Ka Mahatma.  He won the Bengal Film Journalists' Association Awards for best lyricist for Swaralipi (1962), Palatak (1964), Anthony Firingee (1968), Bon Palashir Padabali (1974), Sanyasi Raja (1976) and Anurager Chhoan (1987, posthumously).
Answer: classical Kathak