Write SQL query to solve given problem: Show the name of the university with the lowest number of students in 2015.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.university_name FROM university_year AS T1 INNER JOIN university AS T2 ON T1.university_id = T2.id WHERE T1.year = 2015 ORDER BY T1.num_students ASC LIMIT 1