Question: what is the function of the major histocompatibility complex
[{'answer': 'recognize foreign molecules in vertebrates', 'provenance': [{'wikipedia_id': '211950', 'title': 'Major histocompatibility complex', 'start_paragraph_id': 2, 'start_character': 141, 'end_paragraph_id': 2, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '211950', 'title': 'Major histocompatibility complex', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 837, 'bleu_score': 0.9074283649296551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7282990147866990929}, 'section': 'Section::::Abstract.'}]}]