input: from typing import List
  
  def run_horror_movie_query(conn: sqlite3.Connection) -> List[tuple]:
      """Runs a SQL query to select all movies from the 'Movies' table where the category is 'horror' and returns the result.
      >>> import sqlite3
      >>> conn = sqlite3.connect(':memory:')
      >>> _ = conn.execute("CREATE TABLE Movies (title TEXT, category TEXT)")
      >>> _ = conn.execute("INSERT INTO Movies (title, category) VALUES ('Halloween', 'horror')")
      >>> run_horror_movie_query(conn)
      [('Halloween', 'horror')]
      >>> conn.close()
      """
      cursor = conn.cursor()
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      return cursor.fetchall()
output:     cursor = conn.cursor()
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      return cursor.fetchall()