The correct answer is C. Panacea.
A panacea is a substance or treatment claimed to have a universal or apparently universal curative effect. The word comes from the Greek pan-, meaning “all”, and -akesis, meaning “cure”.
Exorcism is the act of evicting a demon or other spiritual entity from a person or place. It is often performed by a religious figure, such as a priest or shaman.
Incantation is a word or phrase that is repeated in a ritual or ceremony. It is often used to invoke a supernatural power or to bring about a desired effect.
Antibiotic is a substance that kills or inhibits the growth of bacteria. It is used to treat bacterial infections.
Panacea is the correct answer because it is a substance that is claimed to have a universal curative effect. Exorcism, incantation, and antibiotic are not substances that are claimed to have a universal curative effect.