Question: What is the nationality of the person who was signed to compose the score and soundtrack of "Dhobi Ghat"?

Context paragraphs:
Peddlers (film): Peddlers is a 2012 Indian Hindi crime thriller film written and directed by Vasan Bala.  The film features Gulshan Devaiah, Nishikant Kamat, Kriti Malhotra (of Dhobi Ghat fame), Nimrat Kaur and Siddharth Menon in the lead roles.  The film was screened as part of 2012 International Critics' Week, an independent film event which runs parallel to the Cannes Film Festival in southern France.

Kriti Malhotra: Kriti Malhotra is a Bollywood Actress and Costume Designer, who appeared in "Dhobi Ghat".

Dhobi Ghat (film): Dhobi Ghat (also known as "Mumbai Diaries") is a 2011 Indian drama film directed by Kiran Rao in her directorial debut.  The film produced by Aamir Khan Productions, Reliance Entertainment, Shree Ashtavinayak Cine Vision Ltd stars Prateik Babbar, Monica Dogra, Kriti Malhotra and Aamir Khan in the lead roles.  Gustavo Santaolalla was signed to compose the score and soundtrack of the film, which includes a song by Ryuichi Sakamoto.

Dhobi Ghat: Dhobi Ghat (Mahalaxmi Dhobi Ghat) is a well known open air laundromat in Mumbai, India.  The washers, locally known as Dhobis, work in the open to wash the clothes from Mumbai's hotels and hospitals.

Monica Dogra: Monica Dogra is an American musician and actress of Indian origin.  She is one half of the Mumbai-based electronic rock duo Shaa'ir and Func and also performs solo under her moniker, Shaa'ir.  She made her acting debut in the Bollywood film "Dhobi Ghat" (2011).  She is a member on the judging panel of India's first English music talent show, The Stage.

Jahanpanah City Forest: Jahanpanah City Forest is located in South Delhi.  It is one of the dense forested park in Delhi spreading over 435 acres of land.  The park is accessible from Greater Kailash II, Tughlakabad Extension, Batra Gate, Dhobi Ghat, Sheikh Sarai, Chirag Delhi, Masjid Moth DDA Flats and Balvantray Mehta Vidya Bhawan School.

Gustavo Santaolalla: Gustavo Alfredo Santaolalla (born 19 August 1951) is an Argentine musician, film composer and producer.  He has won Academy Awards for Best Original Score in two consecutive years, for "Brokeback Mountain" in 2005, and "Babel" in 2006.  More recently, he composed the original score for the video game "The Last of Us", and the theme music for the Netflix series "Making a Murderer".

Dhobi Ghat Grounds: Dhobi Ghat Ground is a popular pitch in Faisalabad.  It is situated in the center of city, near the main train station and Bhawana Bazaar.  It is also known as Iqbal Park.

Delhi Belly (film): Delhi Belly is a 2011 Indian black comedy film written by Akshat Verma and directed by Abhinay Deo.  It stars Imran Khan, Kunaal Roy Kapur, Vir Das, Poorna Jagannathan and Shenaz Treasurywala.  While the original version was in English, a Hindi dubbed version was also released.  The film is produced by Aamir Khan Productions and IBC Motion Pictures.  The theatrical trailer of the film premiéred with Aamir Khan's "Dhobi Ghat" on 21 January 2011 while the film was released on 1 July 2011.  The film was given an 'A' certificate for its profanity and sexual content.  The film was remade in Tamil as "Settai".

St. Ignatius High School (Mahalakshmi): St. Ignatius High School is a K-10 school near Mahalakshmi Station in Mumbai, India.  It is situated near the famous Mahalaxmi Racecourse, Kasturba Hospital, Dhobi Ghat and Arthur Road Jail.  It is run by the Jesuit Priests.  Also it has been said and printed in newspaper as a heritage site worth watching.  It completed its 100 years in November 2014.

Supporting paragraphs: Dhobi Ghat (film) Gustavo Santaolalla
Answer: Argentine