Question: what is the most common cause of right ventricular heart failure
[{'answer': 'pulmonary heart disease', 'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'start_paragraph_id': 15, 'start_character': 45, 'end_paragraph_id': 15, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Signs and symptoms.:Right-sided failure.\n'}]}, {'answer': 'left - sided heart failure', 'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'start_paragraph_id': 7, 'start_character': 162, 'end_paragraph_id': 7, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Signs and symptoms.\n'}]}, {'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18105468909497114898}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 209, 'bleu_score': 0.8498644646741501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18105468909497114898}, 'section': 'Section::::Signs and symptoms.:Right-sided failure.\n'}]}, {'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 267, 'bleu_score': 0.8977528478480281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18105468909497114898}, 'section': 'Section::::Signs and symptoms.\n'}]}, {'provenance': [{'wikipedia_id': '5595237', 'title': 'Right ventricular hypertrophy', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Right ventricular hypertrophy (RVH) is a condition defined by an abnormal enlargement of the cardiac muscle surrounding the right ventricle. The right ventricle is one of the four chambers of the heart. It is located towards the lower-end of the heart and it receives blood from the right atrium and pumps blood into the lungs. Since RVH is an enlargement of muscle it arises when the muscle is required to work harder. Therefore, the main causes of RVH are pathologies of systems related to the right ventricle such as the pulmonary', 'It is located towards the lower-end of the heart and it receives blood from the right atrium and pumps blood into the lungs. Since RVH is an enlargement of muscle it arises when the muscle is required to work harder. Therefore, the main causes of RVH are pathologies of systems related to the right ventricle such as the pulmonary']}}]}, {'provenance': [{'wikipedia_id': '249930', 'title': 'Heart failure', 'section': 'Section::::Signs and symptoms.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['There are several other exceptions to a simple left-right division of heart failure symptoms. Additionally, the most common cause of right-sided heart failure is left-sided heart failure. The result is that people commonly present with both sets of signs and symptoms.', 'There are several other exceptions to a simple left-right division of heart failure symptoms. Additionally, the most common cause of right-sided heart failure is left-sided heart failure. The result is that people commonly present with both sets of signs and symptoms.', 'There are several other exceptions to a simple left-right division of heart failure symptoms. Additionally, the most common cause of right-sided heart failure is left-sided heart failure. The result is that people commonly present with both sets of signs and symptoms.']}}]}]