input: from typing import List
  
  def execute_query(category: str) -> List[tuple]:
      """ Given a category, execute a SQL query to fetch all movies from the 'Movies' table that belong to the specified category.
      The function connects to a SQLite database named 'movies.db', executes the query, and returns the result as a list of tuples.
      >>> execute_query('horror')
      [(1, 'The Exorcist', 'horror'), (2, 'Halloween', 'horror')]
      """
output:     import sqlite3
      conn = sqlite3.connect('movies.db')
      cursor = conn.cursor()
      cursor.execute("SELECT * FROM Movies WHERE category = ?", (category,))
      result = cursor.fetchall()
      conn.close()
      return result