Question

which glands produce relatively thin, watery fluids?
mixed
mucous
serous
cytogenic

Explanation:

Serous glands secrete a relatively thin, watery fluid. Mucous glands secrete mucus which is thick and viscous. Mixed glands secrete a combination of both serous - like and mucous - like secretions. Cytogenic is not a type of gland related to this secretion description.

Answer:

C. Serous