Question: who presides over the joint sitting of the two houses of parliament
[{'answer': 'Speaker of the Lok Sabha', 'provenance': [{'wikipedia_id': '49973970', 'title': 'Joint Session of the Parliament of India', 'start_paragraph_id': 2, 'start_character': 147, 'end_paragraph_id': 2, 'end_character': 171, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]