Option 1: Sushruta - Sushruta was a renowned physician in ancient India and is considered one of the fathers of modern surgery. He is known for his contributions to the field of medicine, especially in the area of surgery.

Option 2: Charaka - Charaka was an ancient Indian physician and is known as one of the principal contributors to Ayurveda, the traditional Indian system of medicine. He wrote the Charaka Samhita, which is a foundational text in Ayurveda.

Option 3: Charvaka - Alert - The correct answer should be Charvaka. Charvaka was not a physician. He was a philosopher and skeptic in ancient India, known for his materialistic and atheistic views.

Option 4: Dhanvantari - Dhanvantari is a legendary figure in Ayurveda and Hinduism. He is considered the god of medicine and is often depicted as a divine physician. He is believed to have discovered Ayurveda and revealed its principles to mankind.

In summary, among the given options, Charvaka was not a physician.