Option b is the correct answer. Chhandogya Upanishad of Sama Veda states that Ghora Angirasa taught the sacrificial nature of human life to Krishna, the son of Devaki, whereby he became free from all desires. Angiras or Angirasa was a mind born son of Brahma. The name Krishna is also mentioned in the Chhandogya Upanishad, which says: "I offer my respectful obeisances to Shri Krishna, the son of Devaki." Important Tips Mahabharata: The Mahabharata is an ancient Indian epic where the main story revolves around two branches of a family - the Pandavas and Kauravas - who, in the Kurukshetra battle for the throne of Hastinapura. Krishna Dvaipayana or Veda vyasa composed it. According to tradition, he dictated the verses and Ganesha wrote them down. The Bhagavad Gita, often referred to as the Gita, is a 700 -verse Hindu scripture, which is part of the epic Mahabharata. Ashtadhyayi or Eight Chapters: Astadhyayi is a Sanskrit Treatise on grammar written in 6th to 5th century B.C. by the Indian grammarian Panini. This work set the linguistic standards for classical Sanskrit. It sums up in 4000 sutras the science of phonetics and grammar that had evolved in the Vedic religion. Panini is considered as the 'father of linguistics'. Bhagavata Purana: The Srimad Bhagavatam is popularly known as Bhagavata Purana, which is one of the 18 Puranas in Hinduism. Veda Vyasa wrote the Bhagavata Purana.