FOR 2016 batch West Bengal cadre IAS Dhiman Barai, Indian Administrative Service was always a “default option”, but “not an immediate plan” after his MBA from IIM-B. But what made him plunging into IAS preparation, ending up getting his home cadre as an IAS. The IAS Association has recently tweeted a Facebook post where the officer narrated how his career choice changed after the demise of his father. The officer wrote, life isn't about plans. Barai, 31, grew up in a big…