Questionnaire (Part C) : Multiple checklist of inhaler technique. To evaluate the respondents' inhaler technique a single page with multiple checklist created by Vicky Kritikos will be adapted. The checklists contain six types of inhaler technique medication, such as Metered Dose Inhaler (MDI) with spacer, MDI, Turbuhaler, Accuhaler, Intranasal device and Handihaler. Subjects will be asked by investigator to demonstrate how they use the inhaler medication individually. Incorrect step of inhaler technique will be highlighted and emphasis during the AEP.