This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
Punched out ulcer in oesophagus on endoscopy in a immunocompromised patient is seen in 
Select and explain. 
A. Herpes zoster virus, B. Herpes simplex virus, C. Cytomegalo virus, D. Candidiasis
B: Herpes simplex virus
Answer: B: Herpes simplex virus 
Explanation: Dysphagia and odynophagia are the symptoms caused by herpes. There may be history of heretic lesion on lip some days earlier. Endoscopy reveals vesicles or small ulcers with raised margins, usually in the upper half of the oesophagus. Ref: Bailey and love 27th edition Pgno: 1104