verbose: Whether chains should be run in verbose mode or not. Note that this
            applies to all chains that make up the final chain.
    Returns:
        A chain to use for question answering with sources.
    """
    loader_mapping: Mapping[str, LoadingCallable] = {
        "stuff": _load_stuff_chain,
        "map_reduce": _load_map_reduce_chain,
        "refine": _load_refine_chain,
        "map_rerank": _load_map_rerank_chain,
    }
    if chain_type not in loader_mapping:
        raise ValueError(
            f"Got unsupported chain type: {chain_type}. "
            f"Should be one of {loader_mapping.keys()}"
        )
    _func: LoadingCallable = loader_mapping[chain_type]
    return _func(llm, verbose=verbose, **kwargs)