<qa>  What was the first record of symptom?Examine results of all patients from all arms were recorded before and after the 10 day treatment. The examine recorded are FENO levels, cough symptom assessment, cough visual assessment, Leicester cough questionnaire, total white blood cell count, neutrophil blood percentage, eosinophil blood percentage. Patient cough free days after treatment and Montelukast Sodium Tablets . Follow up was carried out at the 8th week after first record of symptom and 2 month after treatment. 