<prompt> Pasteurization is done at-73 oC For 20 min63 oC For 30 min72 oC For 30 seconds63oC For 30 seconds  <response>: Pasteurization of milk, widely practiced in several countries, notably the United States, requires temperatures of about 63deg C 145deg F maintained for 30 minutes or, alternatively, heating to a higher temperature, 72deg C 162deg F, and holding for 15 seconds and yet higher temperatures for shoer periods of time. 