What is a microlith?
A. Microliths were small, polished, sharp stone tools
B. Rock painting
C. Large stone tools
D. None of the above

Hint: These were an integral feature in the Mesolithic or Middle Stone Age. The etymology of the term itself answers the question; micro, meaning small + lith, meaning stone.

Complete answer: Option A. These were made 35000 to 30000 years ago in the continents of Asia, Africa and Australia. They are of two kinds, laminar (usually larger) and geometric. Production declined with rise in farming. This is the correct answer.
Option B. Also known as parietal art, this was seen in prehistoric times. It contained petroglyphs. This option is incorrect.
Option C. These were usually made of Basalt or Granite. This is not the right option.
Option D. This option becomes irrelevant.

Thus, Option A is the correct answer.

Note: They were mainly used in triangular multi-functional tools like arrows and spears. They were mostly made of chert or flint and were a couple centimetres in length.