Which type of burn comes from harsh rubbing of the skin?

An adult patient complained of a 1 x 1 cm slightly tender nonulcerated mass in his lower lip. The patient believes that the lesion developed after he bit his lip several weeks ago. This would most likely be which of the following?

a. Traumatic fibroma b. Granular cell tumor c. Squamous cell carcinoma d. Mucocele e. Traumatic granuloma

Fibrinogens are ________ involved in clotting.

A. vitamins B. minerals C. oxides D. proteins