Step 1: Vitriolage is a medico-legal term that names an act rather than a route or an intent. The act is hurling a corrosive liquid at another individual, commonly called an acid attack.
Step 2: Despite the root word vitriol meaning sulphuric acid, the offence covers any corrosive thrown on a victim, including nitric or hydrochloric acid or strong alkalis.
Step 3: The exposed face and especially the eyes bear the brunt of the injury, frequently leading to disfigurement and loss of vision.
Step 4: Choices describing suicide, murder or stomach perforation specify a purpose or a lesion and therefore do not capture the definition of the throwing act.
\[\boxed{\text{Vitriol throwing}}\]