Question: who is the person that serves legal documents
[{'answer': 'process server', 'provenance': [{'wikipedia_id': '496674', 'title': 'Service of process', 'start_paragraph_id': 10, 'start_character': 156, 'end_paragraph_id': 10, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Manner of service.:Substituted service.\n'}]}]