system: 
You are an expert in composing functions. You are given a question and a set of possible functions.
Based on the question, you will need to make one or more function/tool calls to achieve the purpose.
If none of the function can be used, point it out. If the given question lacks the parameters required by the function,
also point it out. You should only return the function call in tools call sections.

If you decide to invoke any of the function(s), you MUST put it in the format of [func_name1(params_name1=params_value1, params_name2=params_value2...), func_name2(params)]

You SHOULD NOT include any other text in the response.

Here is a list of functions in JSON format that you can invoke.

[{'name': 'weather.get_weather_data', 'description': 'Retrieves current weather data including temperature, wind speed, and precipitation levels for a specified city and country. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['city', 'country'], 'properties': {'city': {'type': 'string', 'description': "The name of the city for which weather data is being requested, e.g., 'San Francisco'."}, 'country': {'type': 'string', 'description': "The country in which the city is located, using ISO 3166-1 alpha-2 country codes, e.g., 'US' for the United States."}, 'units': {'type': 'string', 'description': 'The unit system for the temperature (Celsius or Fahrenheit) and wind speed (m/s or mph).', 'enum': ['metric', 'imperial'], 'default': 'metric'}, 'language': {'type': 'string', 'description': "The language code for the response data, such as 'en' for English or 'es' for Spanish.", 'enum': ['en', 'es', 'fr', 'de'], 'default': 'en'}}}}, {'name': 'stock_price.get', 'description': 'Retrieve the current stock price for a specified ticker symbol from the stock market. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['ticker'], 'properties': {'ticker': {'type': 'string', 'description': "The stock ticker symbol for which the price is being requested, such as 'AAPL' for Apple Inc."}, 'exchange': {'type': 'string', 'description': "The stock exchange where the ticker is listed, such as 'NASDAQ' or 'NYSE'.", 'enum': ['NASDAQ', 'NYSE', 'AMEX'], 'default': 'NASDAQ'}, 'date': {'type': 'string', 'description': "The date for which the stock price is requested, in the format 'YYYY-MM-DD'. If not provided, the latest available price is returned.", 'default': None}}}}]


user: Could you provide the current weather data for London in the UK, including the temperature, wind speed, and precipitation levels?

Available functions:
[{"name": "weather.get_weather_data", "description": "Retrieves current weather data including temperature, wind speed, and precipitation levels for a specified city and country.", "parameters": {"type": "dict", "required": ["city", "country"], "properties": {"city": {"type": "string", "description": "The name of the city for which weather data is being requested, e.g., 'San Francisco'."}, "country": {"type": "string", "description": "The country in which the city is located, using ISO 3166-1 alpha-2 country codes, e.g., 'US' for the United States."}, "units": {"type": "string", "description": "The unit system for the temperature (Celsius or Fahrenheit) and wind speed (m/s or mph).", "enum": ["metric", "imperial"], "default": "metric"}, "language": {"type": "string", "description": "The language code for the response data, such as 'en' for English or 'es' for Spanish.", "enum": ["en", "es", "fr", "de"], "default": "en"}}}}, {"name": "stock_price.get", "description": "Retrieve the current stock price for a specified ticker symbol from the stock market.", "parameters": {"type": "dict", "required": ["ticker"], "properties": {"ticker": {"type": "string", "description": "The stock ticker symbol for which the price is being requested, such as 'AAPL' for Apple Inc."}, "exchange": {"type": "string", "description": "The stock exchange where the ticker is listed, such as 'NASDAQ' or 'NYSE'.", "enum": ["NASDAQ", "NYSE", "AMEX"], "default": "NASDAQ"}, "date": {"type": "string", "description": "The date for which the stock price is requested, in the format 'YYYY-MM-DD'. If not provided, the latest available price is returned.", "default": null}}}}]

Ground-truth function call:
[{"weather.get_weather_data": {"city": ["London"], "country": ["GB"], "units": ["", "metric"], "language": ["", "en"]}}]