Question

a company sells a natural medicine with plant ingredients to help treat dementia, a disease in which people have a hard time remembering things.
the natural ingredients in the medicine are most likely from which type of plant?

Explanation:

Ginkgo has been studied for its potential cognitive - enhancing effects. While more research is needed, it is a plant that is often associated with improving memory and cognitive function, which could be relevant for a medicine targeting dementia (a disease with memory issues). Parsley is mainly used as a culinary herb. Coriander is also mainly for culinary and some minor medicinal uses not typically related to dementia - like memory issues. Yeast is a fungus, not a plant, and its uses are more in baking, brewing, and some probiotic applications.

Answer:

ginkgo