Question: Khwahish is a Hindi remake of a 1970 American romantic drama film written by who?

Context paragraphs:
Happy Days (2007 film): Happy Days is a 2007 Telugu musical coming of age film written, produced and directed by Sekhar Kammula.  The target audience for this movie was primarily the engineering college students in the Telugu speaking states.  The Kannada remake was called "Jolly days" and in Tamil as "Inidhu Inidhu" by noted Indian actor Prakash Raj.  The film won 6 Filmfare Awards South, and 3 Nandi Awards.  The Hindi remake of Happy Days will be directed by Sekhar himself,and it will be co-produced by Salman Khan.

Kalyana Samayal Saadham: Kalyana Samayal Saadham (English: "Wedding Feast" ) is a 2013 Indian Tamil romantic comedy film written and directed by RS Prasanna.  It features Prasanna and Lekha Washington in the lead roles.  Produced by Ananth Govindan and Arun Vaidyanathan under the Everest Entertainment banner, it was distributed by ABITCS Studios, Thirukumaran Entertainment and RPP Film Factory.  Krishnan Vasant was the cinematographer and Arrora the music composer.  The film released on 6 December 2013 to critical acclaim.  Rs Prasanna also directed the Hindi remake of this film titled "Shubh Mangal Savdhan".

XX/XY: XX/XY is a 2002 American romantic drama film starring Mark Ruffalo, Kathleen Robertson, and Maya Stange.  The film is a romantic drama written and directed by Austin Chick, the title referring to the different chromosome pairings present in men and women.  It was nominated for the Grand Jury Prize at the Sundance Film Festival in the year it was released.  Although the funding for the film came from the US, the film was produced by British company Natural Nylon.

Saathiya (film): Saathiya (Hindi: साथिया, English: "Companion") is a 2002 Indian Hindi romantic drama film directed by Shaad Ali and produced by Mani Ratnam and Yash Chopra under the banner of Yash Raj Films.  The film stars Rani Mukerji opposite Vivek Oberoi in lead roles.  The soundtrack was composed by A. R. Rahman.  It is a remake of the Tamil film "Alaipayuthey", which was directed by Ratnam and also had its music composed by Rahman as well.

Khwahish: Khwahish (English: "Desire") is a 2003 Indian Hindi romance film directed by Govind Menon.  The film stars Himanshu Malik and Mallika Sherawat in leading roles.  Sherawat made her acting debut in the film.  Although the film was quite racy by Indian standards, it was known for its naturalistic and realistic topic, being a serious film with a tragic end.  This is a Hindi remake of "Love Story".

Badlapur Boys: Badlapur Boys is a 2014 Hindi drama film directed by Shailesh Verma and produced by A. Muthu and Salim Tanwar.  It stars Nishan, Saranya Mohan, Annu Kapoor and Puja Gupta in lead roles.  Ankit (Saurabh) Sharma Played the character of deenu in this film.The film is about a team of Kabaddi players in a family romantic drama with sports as a backdrop.  It is a remake of the Tamil hit film "Vennila Kabadi Kuzhu".  Bollywood editor A. Muthu, who has edited more than 50 films (including Sadak, Deewana, Balwan, Raja Babu, Judwa, Ziddi, Haseena Maan Jayegi), took the remake rights of Tamil film Vennila Kabadi Kuzhu and produced this film.

Maro Charitra: Maro Charitra (English: "Another History") is a 1978 Telugu-language Indian romantic tragedy film written and directed by K. Balachander.  It stars Kamal Haasan and Saritha in the lead with Madhavi and Sarath Babu appearing in prominent roles.  The film deals with cross-cultural romance between a Tamil boy and a Telugu girl.  Upon release, it was commercially successful and remains a cult classic.  Owing to its success in Andhra Pradesh, the film was released in the neighbouring states of Tamil Nadu and Karnataka without being dubbed into the respective languages.  Balachander won a Best Director at the Southern Filmfare Awards in 1979.  Later in 1981, Balachander remade the film in Hindi as "Ek Duuje Ke Liye" with Kamal Haasan reprising his role.  Saritha, the female lead, was, however, replaced by Punjabi actress Rati Agnihotri.  The Hindi remake became a success as well.  Both the films were listed among CNN-IBN's 100 greatest Indian films of all time in 2013.

Desire (1936 film): Desire is an American romantic drama film released in 1936 and directed by Frank Borzage.  It was produced by Borzage and Ernst Lubitsch.  The picture is a remake of the 1933 German film "Happy Days in Aranjuez".  The screenplay was written by Samuel Hoffenstein, Edwin Justus Mayer and Waldemar Young based on the play "Die Schönen Tage von Aranjuez" by Hans Székely and Robert A. Stemmle.  The music score was composed by Frederick Hollander and the cinematography was shot by Charles Lang and Victor Milner.  Marlene Dietrich's wardrobe was designed by Travis Banton.

Prem Ki Bujhini: Prem Ki Bujhini (English: Don't Understand what is love ; Bengali : প্রেম কি বুঝিনি) is a 2016 Indo-Bangladesh joint venture romantic drama film directed by Sudipto Sarkar and starring Om and Subhasree Ganguly.  It is a remake of the 2011 Telugu Hit romantic drama film "100% Love" starring Naga Chaitanya and Tamannaah.

Love Story (1970 film): Love Story is a 1970 American romantic drama film written by Erich Segal, who was also the author of the best-selling novel of the same name.  It was produced by Howard G. Minskyand directed by Arthur Hiller and starred Ali MacGraw and Ryan O'Neal, alongside John Marley, Ray Milland, and Tommy Lee Jones in his film debut in a minor role.

Supporting paragraphs: Khwahish Love Story (1970 film)
Answer: Erich Segal