input: Write a python function to parse a JSON string and extract specific fields.
  assert parse_json('{"name": "John", "age": 30, "is_married": false}') == ('John', 30, False)
  assert parse_json('{"name": "Alice", "age": 25, "is_married": true}') == ('Alice', 25, True)
  assert parse_json('{"name": "Bob", "age": 22, "is_married": false}') == ('Bob', 22, False)
output: import json
  
  def parse_json(json_string):
      data = json.loads(json_string)
      return data['name'], data['age'], data['is_married']