I'll give you a question, please answer with step-by-step reasoning process. His rural dental office was never crowded, but since moving where it has been nonstop crowded?\nOptions:\n- medical building\n- urban area\n- strip mall\n- city\n- metro area

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Urban area is a human settlement with a high population density and infrastructure of built environment. Urban areas are created by urbanization and are categorized by the urban morphology as cities, owns, conurbations or suburbs. His rural dental office was never crowded, but since moving to urban area it has been nonstop crowded.
The answer: urban area.
Assistant