input: Write a function to create an instance of the "sru" class and use its "search" method to retrieve search results from the KB SRU API. The function should take a query string and optionally a collection name, start record number, maximum number of records to return, and record schema as input parameters. The function should return the response object containing the search results. If the search provides no results, the function should return False.
  assert retrieve_search_results("test query", "GGC") != False
  assert retrieve_search_results("empty query", "GGC") == False
  assert retrieve_search_results("book", "DPO", 1, 3, "dcx") != False
  assert retrieve_search_results("unknown query") == False
output: def retrieve_search_results(query, collection=None, start_record=1, max_records=10, record_schema=None):
      sru_instance = sru()
      response = sru_instance.search(query, collection, start_record, max_records, record_schema)
      if response.get('numberOfRecords', 0) == 0:
          return False
      return response