The phrase "Which among the following is" is typically used to ask a question that requires selecting the correct option(s) from a given list. Based on the search results, here are some examples of how this phrase is used in different contexts:

• In education, it is used to identify correct statements or facts, such as:
  • "Which among the following is/are correct?" with options about mental computation skills in primary school children, where the correct answers are statements encouraging mental computation and use of formal/informal strategies

* "Which among the following is/are true about computation in basic operations for Grade-II learners?" where developing informal strategies and estimation are correct

• In biology, it is used to select correct scientific facts, for example:
  • "Which among the following is correct?" regarding gametes and spores being haploid, where the correct answer is that gametes are invariably haploid

• In chemistry, it is used to identify elements or compounds:
  • "Which among the following is an element?" where graphite (an allotrope of carbon) is the correct answer, distinguishing it from compounds and alloys

• In social studies or current affairs, it is used to identify types of problems:
  • "Which among the following is an international problem?" with the correct answer being "Problems of refugees"

• In communication or education, it is used to identify types of questions:
  • "Which among the following is a type of discussion question?" with options like rhetorical, probing, divergent, and factual questions

Thus, the phrase "Which among the following is" is a common question format used across various subjects to prompt selection of correct or relevant options from a list. The exact answer depends on the context and the options provided.