Q. Consider the following key points on Indian Knowledge System:

1. The Sushruta Samhita describes rhinoplasty.
2. Sulba Sutras are treatises on ancient astronomical systems in use in India
3. Ashtadhyayi is a treatise on grammar.
4. Nirkuta is one of the Vedangas focussing on phonetics, phonology, pronunciation

Which of the above is/are correct?
Answer: Only 1 & 3
Notes: The Sushruta Samhita, authored by Sushruta in 600 BCE, details rhinoplasty surgery. The Shulba Sutra, written by Baudhayana in 800 BCE, introduces the Pythagorean Theorem. Panini's Ashtadhyayi, from the 4th century BCE, is the only complete grammar of any language. Yaska's Nirukta, from the 7th century BCE, is the first significant work on etymology.