What is the cause of this rash?

A. Bullous impetigo
B. Chicken pox (varicella)
C. Contact dermatitis
D. Shingles (herpes zoster)
E. Smallpox (variola)
F. Smallpox vaccine (vaccinia)
G. Other

Image from CDC website: http://www.bt.cdc.gov/agent/smallpox/smallpox-images/index.asp