Question: how many plane surfaces does a cylinder have
[{'answer': 'two parallel planes', 'provenance': [{'wikipedia_id': '859283', 'title': 'Cylinder', 'start_paragraph_id': 7, 'start_character': 45, 'end_paragraph_id': 7, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Solid cylinders.\n'}]}, {'answer': 'two'}, {'provenance': [{'wikipedia_id': '859283', 'title': 'Cylinder', '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': 13261437252307955524}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '859283', 'title': 'Cylinder', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 740, 'bleu_score': 0.867488575758462, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13261437252307955524}, 'section': 'Section::::Solid cylinders.\n'}]}, {'provenance': [{'wikipedia_id': '859283', 'title': 'Cylinder', 'section': 'Section::::Solid cylinders.:Cylindric sections.\n', 'start_paragraph_id': 16, 'end_paragraph_id': 16, 'meta': {'evidence_span': ['If a plane intersects a base of the cylinder in exactly two points then the line segment joining these points is part of the cylindric section. If such a plane contains two elements, it has a rectangle as a cylindric section, otherwise the sides of the cylindric section are portions of an ellipse. Finally, if a plane contains more than two points of a base, it contains the entire base and the cylindric section is a circle.', 'For a right circular cylinder, there are several ways in which planes can meet a cylinder. First, consider planes that intersect a base in at most one point. A plane is tangent to the cylinder if it meets the cylinder in a single element. The right sections are circles and all other planes intersect the cylindrical surface in an ellipse. If a plane intersects a base of the cylinder in exactly two points then the line segment joining these points is part of the cylindric section. If such a plane contains two elements, it has a rectangle as a cylindric section, otherwise the sides of the cylindric section are portions of an ellipse. Finally, if a plane contains more than two points of a base, it contains the entire base and the cylindric section is a circle.', 'First, consider planes that intersect a base in at most one point. A plane is tangent to the cylinder if it meets the cylinder in a single element.']}}]}]