def extract_list_item(source_data, item_pos):
    """Extract specific items from a list of lists.
    
    Extracts the item in item_pos from each list within a list of lists and
    returns a list with just the extracted items.
    
    Args:
        source_data (list): A list of lists.
        
    Returns:
        extracted_items (list): List of the extracted items.
    """
    extracted_items = []
    for item in source_data:
        target_item = item[item_pos]
        extracted_items.append(target_item)
    return extracted_items