Which of the following singular nouns does not form an irregular plural?

Question

anonymous · Answer

u haven't posted the singular nouns..incomplete question..i guess!!!

anonymous · Answer

nouns like- news,economics, gallows,phonetics,athletics, mathematics, ethics, optics,physics, statistics,dynamics,rickets,,etc use 's' at end and seem like plural nouns  but are singualr nouns..

anonymous · Answer

for example, we don't write; Mathematics are my favourite subject.
But we write, Mathematics is my favourite subject.. it is because it is an singular noun bt forms irregular plural!! Hope u got me.. :)