This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
'Trench mouth' is : 
Select and explain. 
A. Sub mucosal fibrosis, B. Tumour at uveal angle, C. Ulcerative lesion of the tonsil, D. Retension cyst of the tonsil
C: Ulcerative lesion of the tonsil
Answer: C: Ulcerative lesion of the tonsil 
Explanation: Ans- (Ulcerative lesion in the tonsil) (202-D) (87-LT)Ulcerative gingivitis - is a highly infectious and ulcerative lesion of the tonsils.It was common during the first world war, being called Trench mouth of Vincent's angina .