This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Regarding Addisonian pigmentation, all are true EXCEPT : 
Select and explain. 
A. Involves moles and scars, B. Involves palmer creases, C. Does not involve oral mucosa, D. Decreased fibrosis
C: Does not involve oral mucosa
Answer: C: Does not involve oral mucosa 
Explanation: Answer is C (Does not involve oral mucosa) : Pigmentation in Addison's disease In Addison's disease pigmentation appears as a diffuse brown, tan, or bronze darkening of skin This increased pigmentation is diffuse but may be accentuated in the Palmer crease Sites of friction & pressure areas - knuckles, elbows, knees, nail beds - belt brassier line, buttocks Scars Oral mucosa, gums & conjunctival Areolae of nipples