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: Dental
Mucous lesions are seen in – a) Sec. Syphilisb) Dermatitis herpetiformisc) Psoriasisd) Pemphiguse) Porphyria 
Select and explain. 
A. b, B. c, C. ac, D. ad
D: ad
Answer: D: ad 
Explanation: None