Question: Who developed a useful staining method to identify bacteria?

context: No context provided
question: How could the person be described who developed a staining method that could be used to identify bacteria?
short_answers: Danish bacteriologist
context: Gram stain or Gram staining, also called Gram's method, is a method of staining used to distinguish and classify bacterial species into two large groups (Gram-positive and Gram-negative). The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique.
question: Which Danish bacteriologist developed a useful staining method to identify bacteria?|What is the name of the person who developed a staining method to identify bacteria?|Which Danish bacteriologist developed a useful staining method to identify bacteria in two large groups?
short_answers: Hans Christian Joachim Gram
Hans Christian Gram
context: Ziehl-Neelsen staining is a type of Acid-fast stain, first introduced by Paul Ehrlich. Ziehl–Neelsen staining is a bacteriological stain used to identify acid-fast organisms, mainly Mycobacteria. It is named for two German doctors who modified the stain: the bacteriologist Franz Ziehl (1859–1926) and the pathologist Friedrich Neelsen (1854–1898).
question: Who developed a useful staining method to identify acid-fast organisms?
short_answers: Paul Ehrlich

Answer: Gram stain or Gram staining, also called Gram's method, is a method of staining used to distinguish and classify bacterial species into two large groups, Gram-positive and Gram-negative. The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique. Ziehl-Neelsen staining is a type of Acid-fast stain, first introduced by Paul Ehrlich. Ziehl–Neelsen staining is a bacteriological stain used to identify acid-fast organisms, mainly Mycobacteria.