The correct answer is Kanishka. Charak was a member of the court of Kanishka. Charaka:He was the court physician of Kanishka I. He also contributed to ayurvedic science. He compiled the medical treatise called Charaka Samhita. Kanishka:Kanishka founded the second Kushana dynasty. He was the most famous Kushana ruler, he was also known as ‚¬ËœSecond Ashoka‚¬„¢. He started an era in 78 AD which is now known as the Saka Era and is used by the Government of India. Kanishka was a great patron of Mahayana Buddhism. During his reign, the 4th Buddhist Council was held in Kundalavana, Kashmir where the doctrines of the Mahayana form of Buddhism were finalized.