Yet another confusingly–worded question, IMHO.
This was my question, and after a few seconds' thought I answered "coagulation". I never thought of haemostasis; and neither did anyone else in the match I was involved in.
Possibly because in the large majority of cases (such as when you cut your finger), the process of coagulation is sufficient to stop bleeding.
Dictionary.com defines haemostasis as "the stopping of bleeding or arrest of blood circulation in an organ or part, as during a surgical operation."
It's clear from this definition that the word 'haemostasis' refers to any process (a process in this sense being a series of steps) that stops bleeding in any particular instance. Which will involve coagulation.
Wikipedia seems to agree: it defines haemostasis as "a process which causes bleeding to stop ... this involves coagulation ... "
The question setter will no doubt point out that he or she has used the same definition as Wikipedia. Now I will doubtless be accused of pedantry here, but "a process" is not the same as "the process". I would argue that the use of the definite article changes the emphasis from any process (which may or may not involve human intervention) to the natural process that is ultimately essential for the stopping of bleeding.
Most sources, including Wikipedia, point out that haemostasis is the opposite of haemorrhage. It may have helped if the question had pointed this out.
Like I say, I'm going to get accused of pedantry here. But when setting quiz questions, it's vital to be aware of the path down which you're directing the contestant's thoughts. It's not easy to think of a simple way to ask this question unambiguously, but I would suggest something like "In medical practice, what name is given to any process, or series of steps, that stops bleeding in any particular instance?" You could possibly add that any such process will ultimately involve the natural process of coagulation.
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