Who is accredited for the discovery of penicillin?

A. Order of complexity: Order of complexity refers to the organized structure of living systems, from molecules to cells to organisms. While organization is important, it does not directly describe the ability to respond to a stimulus.

B. Sensitivity: Sensitivity is the capacity of an organism to detect and respond to changes or stimuli in its environment. This characteristic allows living beings to adapt behaviorally or physiologically, ensuring survival and interaction with their surroundings.

C. Evolution: Evolution involves gradual genetic changes in populations over generations. It explains long-term adaptation but does not account for an immediate response to a stimulus by an individual organism.

D. Homeostasis: Homeostasis is the maintenance of internal stability, such as temperature or pH, despite external changes. While it can involve responses, it specifically refers to regulation rather than reacting to a particular stimulus.

A. Fleming: Alexander Fleming is credited with the discovery of penicillin in 1928 when he observed that the mold Penicillium notatum produced a substance that killed or inhibited the growth of certain bacteria.

B. Ehrlich: Paul Ehrlich is known for his work in immunology and for developing the concept of a "magic bullet" in chemotherapy, as well as discovering Salvarsan for treating syphilis, but he was not involved in the discovery of penicillin.

C. Pasteur: Louis Pasteur made groundbreaking contributions to microbiology and germ theory, including pasteurization and vaccines for rabies and anthrax.

D. Lister: Joseph Lister pioneered antiseptic surgery and promoted the use of carbolic acid to prevent infections during surgical procedures, but he did not discover penicillin.