Fibrous proteins are characterized by their elongated, insoluble structure and often serve structural or mechanical roles. Among the options provided, keratin, collagen, and myosin are examples of fibrous proteins.

Albumin, on the other hand, is a globular protein that is soluble in water. It has a more spherical shape compared to the elongated shape of fibrous proteins. Albumin is found in blood plasma and has various functions including maintaining osmotic pressure.

So, the correct answer is:

Option B: Albumin.