NEW DELHI : The Centre Tuesday told the Delhi High Court that classification of citizens for the purpose of COVID-19 vaccination is based upon most rational and non-arbitrary criteria depending upon their vulnerability to the disease either due to age or nature of work or co-morbidity health situation and it may not be desirable to create a separate class consisting of lawyers and others below 45 years of age.The Centre made the submission in its affidavit filed in response to a PIL initiated by the high court to examine the demand to declare all people associated with the judicial functioning, including judges, court staff and lawyers, as “frontline workers" so that they could receive COVID-19 vaccination on priority and without.