Correct option is A
Correct Answer:(a) Charak Samhita
Charak Samhita is an ancient Ayurvedic text focusing on herbal medicine and internal medicine (Kaya Chikitsa).
Attributed to Charaka, a key figure in Ayurveda, it details diagnoses, treatments, and medicinal plants.
Charak Samhita is one of the three foundational texts of Ayurveda, the others being Sushruta Samhita (surgery) and Ashtanga Hridaya.
It is written in Sanskrit and organized into eight sections (Sthanas), covering over 120 chapters and 8,400 verses.
(b) Maha Parinirvana Suttanta:
A Buddhist scripture detailing the last days of Buddha, not related to medicine.
(c) Samveda:
One of the four Vedas, primarily a collection of hymns for rituals, not medicinal in nature.
(d) Brighu Samhita:
An astrological and spiritual text, attributed to Sage Bhrigu, not focused on herbal medicine.