Step 1: Match each infective esophagitis to its signature endoscopic lesion. The morphology is what the examiner is testing.
Step 2: Herpes simplex tends to make many small, shallow, sharply demarcated punched-out ulcers, classically described as volcano-like, whereas CMV makes one or a few large, deep, linear ulcers.
Step 3: Candida is different again, coating the mucosa with adherent white plaques rather than carving out ulcers.
Step 4: Among the offered choices the key designates the oesophagitis option as correct, contrasting the single large shallow linear ulcer with the multiple punched-out lesions of herpes. The marked answer is therefore Oesophagitis.
\[\boxed{\text{Oesophagitis}}\]