noun which may take the genitive case particle 'no'
essay-type; essay-style
Used to describe examinations, tests, or questions that require written essay answers rather than multiple-choice or short-answer formats.
この試験は論文式で、選択問題はありません。
This exam is essay-type, with no multiple-choice questions.
論文式の回答には、論理的な構成が求められる。
Essay-style answers require a logical structure.
選択式 means multiple-choice format, the opposite of 論文式.
Compound of 論文 (essay, thesis) and 式 (style, type).