Trismus is seen in commonly-

Ans. is 'b' i.e., Quinsy o Trismus is the inability to open-mouth.o Normal opening of mouth ranges between 25-50mm.o Any value less than this is known as trismus (roughly the opening should permit a minimum of three fingers when inserted sideways).o Causes of quinsy are:-A) Common CausesInfection around the impacted third molarQuinsy (peritonsillar abscess)Submucous fibrosisTM joint dysfunctionB) Less common causesLudwings anginaParotid gland infection and tumorsMalignant otitis externa or furuncle in the external auditory canal.Parapharyngeal and retropharyngeal abscessCarcinoma mandibleTetanusRadiation therapyCarcinoma checkMalignant hyperthermiaComing to the questiono Trismus can occur in all the given options.o However, it is most common and most characteristic of quinsy (among the given options).