MY FATHER IS HAVING SORE THROAT SINCE 2 WEEKS ALREADY HE HAS TAKEN AZITHROMYCIN COURSE,ANTI COUGH BUT STILL THERE IS HOARSENESS ,AGE 65,SMOKER,64 KG WT,HYPERTENSIVE.PREVIOUS SUCH EPISODES OF PERSISTING COUGH AND HOARSENESS.FAMILY HISTORY OF CA ESOPHAGUS AND LARYNX.