They will be asked to sign a surety bond, with a financial penalty of `5 lakh to be paid, in case they fail to honour their promise to return to India after completing their course. 5 lakh = 500,000 (rupees, I suppose). If it is that, it would be $9,196, which isn't all that much for a doctor.
Rs. 5 lakh may be prohibitive to many students in India before they leave for the US.