Following statements are given for local anaesthetic drug lidocaine: [P]: It contains a xylidine moiety. [Q]: It can be used as an antiarrhythmic agent on oral administration. [R]: When administered along with adrenaline its toxicity is reduced and its effect is prolonged. [S]: Chemically it is 2-diethylamino-2',6'-dimethylphenyl acetamide Choose the correct combination of statements.