Explanation:

- Ashtanga Sangraha – Ayurveda: This is a classical text on Ayurveda, written by Vagbhata, covering various aspects of Ayurvedic medical practice.

- Brahma Siddhanta – Philosophy: Brahma Siddhanta is not related to philosophy. It is an ancient Indian astronomical text attributed to Brahmagupta.

- Lilavati – Mathematics: Lilavati is a well-known mathematical treatise written by Bhaskara II, dealing with arithmetic, algebra, and geometry.

- Rupamandana – Iconography: Rupamandana is indeed related to iconography, focusing on the art and icons in Indian culture.

Answer: Brahma Siddhanta – Philosophy