Question: who won the special election held for pennsylvania's 18th congressional district in march of 2018
[{'answer': 'Democrat Conor Lamb', 'provenance': [{'wikipedia_id': '55459674', 'title': "2018 Pennsylvania's 18th congressional district special election", 'start_paragraph_id': 1, 'start_character': 306, 'end_paragraph_id': 1, 'end_character': 325, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55459674', 'title': "2018 Pennsylvania's 18th congressional district special election", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 430, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2650620442764235657}, 'section': 'Section::::Abstract.'}]}]