Home / Ancient History Batch / ART_PHI_1997_95 Foundations of Indian Philosophy UPSC Archival Analysis Exam Year 1997 Evidence Source Link ID: ART_PHI_1997_95 Ref: The Principal Upanishads by S. Radhakrishnan Which one of the following is not included in 'Prasthan trayi'? A. BhagavataB. Bhagavad GitaC. Brahma SutraD. Upanishad