You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Drug of choice for prophylaxis in diphtheria is: and explain in detail?
The options for chemoprophylaxis of diphtheria include Erythromycin (7-10 days oral course) or Benzathine Penicillin G (single intramucular dose). Ref: Erythromycin: A motilin Agonist and Gastrointestinal Prokinetic Agent: American Journal of Gastroenterology 88 (4): 485-90; Basic and Clinical Pharmacology By Katzung, 9th Edition, Section VIII; Park's Textbook of Preventive and Social Medicine By K. Park, 18th Edition, Page 104 and 19th Edition, Page 893