Explanation:

- Toilet-Ek Prem Katha: A social comedy about sanitation issues in India. It was popular for its message, but did not win Best Film.

- Newton: This political satire with Rajkummar Rao was critically acclaimed and was India's entry to the Oscars, but it did not win Best Film.

- Rustom: A crime thriller featuring Akshay Kumar based on a real incident; while it was successful, it did not secure Best Film.

- Hindi Medium: A film starring Irrfan Khan that deals with India's education system issues. It won the Best Film award at the 63rd Jio Filmfare Awards 2018.

- Pan Singh Tomar: A biographical film about an athlete turned dacoit. Critically acclaimed but released in an earlier year, thus not a contender.