Which of the following organism does not produce silk fibre?

Silk fibre is a highly lustrous fibre obtained from the cocoon of silkworms. Mulberry, muga, and eri are different species of silkworms from which we get silk fibre. Mulberry is the most common type of silkworm reared commercially for the production of silk. 

Alpaca is a member of the camel family found in South America. We get wool fibre from the hair of alpaca which is strong, durable, and lightweight.

Thus, Alpaca does not produce silk fibre.