In Indian epistemology, particularly in the Nyaya school, pramanas are recognised as valid means or instruments of knowledge. Perception, inference, comparison and verbal testimony form the canonical four pramanas in early Nyaya. Each provides a distinct route by which cognition can be justified. Therefore the group of knowledge sources mentioned in the stem is correctly called pramanas.
Option A:
Option A, vyaptis, refers to relations of invariable concomitance between hetu and sadhya and is not itself a means of knowledge. Vyapti is used within inference but does not name the broader category of knowledge sources. Hence vyaptis is not appropriate.
Option B:
Option B, hetus, are reasons or middle terms used in inference to support a conclusion. They function within one pramana, anumana, rather than naming all means of knowledge. Thus hetus cannot be the correct answer.
Option C:
Option C, pakshas, are the subjects or loci in which a property is to be established in inference. Again, paksha is a component of inferential structure, not a general type of knowledge source. Therefore pakshas is not suitable here.
Option D:
Option D is correct because pramanas encompass all the recognised independent means through which valid cognition can arise in Nyaya. The examples listed in the question are standard members of this group.
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