Sentence:  It is only this late in the day, and possibly only in Willesden, that you can find best friends <WSD>Sita</WSD> and Sharon, constantly mistaken for each other because <WSD>Sita</WSD> is white (her mother liked the name) and Sharon is Pakistani (her mother thought it best — less trouble). 
Meaning of the word marked with <WSD> tags:  (from=Sanskrit) mainly used in India.