Option b is the correct answer. Ashtanga-Samgraha is a Sanskrit-language work on Ayurveda, the ancient Indian system of medicine. It was written by Vagbhata, a 7th-century physician and scholar. The work is a concise and systematic summary of the teachings of Charaka and Sushruta, the two main authorities of Ayurveda. Dasarupaka ('The Ten Types of Drama') is a Sanskritlanguage treatise on dramaturgy, the art of composing and staging plays. It was written by Dhananjaya, a 10th-century poet and critic. The work is based on the earlier work of Bharata Muni, the Natyashastra, which is considered as the foundational text of Indian classical drama. Lilavati is a Sanskrit-language work on mathematics, written by Bhaskara II, a 12th-century mathematician and astronomer. The work is part of his larger treatise called Siddhantasiromani which covers various topics such as arithmetic, algebra, geometry, trigonometry, and astronomy. Mahabhasya is a Sanskrit-language work on grammar, written by Patanjali, a 2nd-century BCE scholar and philosopher. The work is a commentary on the Ashtadhyayi, which is the foundational text of Sanskrit grammar, composed by Panini, a 6th or 5th-century BCE grammarian.