In this excerpt from The Namesake by Jhumpa Lahiri, which line alludes to Lahiri's Bengali heritage?

At dawn a taxi is called to ferry them through deserted Cambridge streets, up Massachusetts Avenue and past Harvard Yard, to Mount Auburn Hospital. Ashima registers, answering questions about the frequency and duration of the contractions, as Ashoke fills out the forms. She is seated in a wheelchair and pushed through the shining, brightly lit corridors, whisked into an elevator more spacious than her kitchen. On the maternity floor she is assigned to a bed by the window, in a room at the end of the hall. She is asked to remove her Murshidabad silk sari in favor of a flowered cotton gown that, to her mild embarrassment, only reaches her knees.