CREATE TABLE table_28273 ("Sr. No." FLOAT, "Name of Road" TEXT, "Passes Through - District ( s" TEXT, "Length  ( in km ) " TEXT, "MDR No." FLOAT)

What is the MDR number of Rait Charhi Dharamshala?
SELECT MIN("MDR No.") FROM table_28273 WHERE "Name of Road" = 'Rait Charhi Dharamshala'
SELECT MIN("MDR No.") FROM "table_28273" WHERE "Name of Road" = 'Rait Charhi Dharamshala'