input: 
  from typing import List
  
  def select_horror_movies_from_db(db_file: str) -> List[tuple]:
      """ Executes a SQL query to select all movies from the 'Movies' table where the category is 'horror', 
      and returns the results as a list of tuples.
      
      Example:
      >>> select_horror_movies_from_db('movies.db')
      [(1, 'The Conjuring', 'horror'), (2, 'A Quiet Place', 'horror')]
      """
  
output:     import sqlite3
      conn = sqlite3.connect(db_file)
      cursor = conn.cursor()
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      results = cursor.fetchall()
      conn.close()
      return results