Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE Participates_in (actID VARCHAR); CREATE TABLE Activity (activity_name VARCHAR, actID VARCHAR)
### Question:
What is the name of the activity with the most students?
### Answer:
SELECT T1.activity_name FROM Activity AS T1 JOIN Participates_in AS T2 ON T1.actID = T2.actID GROUP BY T1.actID ORDER BY COUNT(*) DESC LIMIT 1