Which epic was written by 'Jaidev'?

Concept: Medieval Sanskrit devotional and musicological literature is identified by pairing each named work with its documented author and courtly period -- recognising this author-work association is how such literary general-knowledge questions are resolved.

Application: Jaidev (Jayadeva), a 12th-century Sanskrit poet at the court of King Lakshmana Sena of Bengal, composed the Geet Govind (Gita Govinda) -- a lyrical devotional poem on the love of Radha and Krishna that became foundational to Vaishnava bhakti literature and to classical art forms such as Odissi and Bharatanatyam.

Cross-check -- the remaining works belong to different authors entirely:

• Rag Tarangini was composed by Lochana Kavi (Lochana Pandita) at the Mithila court, cataloguing ragas and raginis.

• Swarmeil-Kalanidhi was composed by Ramamatya of the Vijayanagara court, classifying ragas under the mela system.

• Hridaya Kautuk was composed by Hridayanarayana Deva, detailing note placement on the veena.

Result: Among the given options, only Geet Govind is the epic authored by Jaidev.