Choose the correct answer.

Discovering penicillin is a very important moment in the history of medicine. This antibiotic helped to cope with many diseases that were considered to be deadly diseases many years ago. It was discovered by Sir Alexander Fleming in 1928. In 1941, one of the Oxford hospital doctors, Charles Fletcher used some penicillin on the patient, and the wound made a spectacular recovery. Unfortunately, Fletcher did not have enough penicillin to fully rid the patient’s body of bacteria, and he died a few weeks later as the bacteria took a hold.

Why did one of Fletcher's patients die who was treated with penicillin?

• This patient got the incorrect dose of antibiotic.
• This patient died of another disease.
• This patient needed penicillin, but he was treated with another cure.
• Charles Fletcher could not do anything because the patient's condition was hopeless.