The question asks us to identify which of the given options is an analgesic. Let's explore each option to determine the correct answer.
Penicillin: Penicillin is a group of antibiotics used to treat bacterial infections. It is not used for pain relief, hence not an analgesic.
Streptomycin: Streptomycin is an antibiotic used to treat bacterial infections like tuberculosis. It does not serve the purpose of pain relief, so it is not an analgesic.
Chloromycetin: Chloromycetin, or Chloramphenicol, is an antibiotic used to treat serious infections. It is not classified as an analgesic.
Novalgin: Novalgin is a well-known analgesic. It is used to relieve pain and reduce fever. Therefore, it is indeed an analgesic.
Thus, the correct answer is Novalgin as it is the only option that serves as an analgesic.