Detailed Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Passage: Padukone found further success in 2013 when all four of her films were box office hits. Among these were two of the highest-grossing Indian filmsthe romantic comedies Yeh Jawaani Hai Deewani and Chennai Express. She also won the Filmfare Award for Best Actress for playing a character based on Juliet in Sanjay Leela Bhansali's tragic romance Goliyon Ki Raasleela Ram-Leela (2013). In 2014, Padukone appeared in the Tamil animation film Kochadaiiyaan and played a bar dancer in the top-grossing heist film Happy New Year. The following year, she played a headstrong architect in Shoojit Sircar's acclaimed comedy-drama Piku, which earned Padukone her second Best Actress award at Filmfare, and portrayed the warrior Mastani in Bhansali's highly successful historical romance Bajirao Mastani. Padukone's first project in Hollywoodthe action film  (2017)earned over US$345 million worldwide. Padukone's highest-grossing Indian release came in 2018 with Bhansali's -grossing period drama Padmaavat, in which she portrayed the titular role of Rani Padmavati.
 Link Information: Yeh Jawaani Hai Deewani finished at $10.50 million approx.

 Question: Which of Padukone's 2013 films grossed the highest?
A:
Answer: Chennai Express