All of the following cause a grey white membrane on the tonsil, except:
(b) Ludwig's angina(Ref. Scott Brown, 8th ed., Vol 3; 550)Ludwig's angina is cellulitis of the sub-mandibular space.The rest of the options can cause membrane over tonsils.
Infectious mononucleosis
Ludwig's angina
Streptococcal tonsillitis
Diphtheria
Tonsils