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
[{'content': 'Pitting nail dystrophy seen in – a) Dermatophytic infectionb) Psoriasisc) Lichen planusd) Seborrheic dermatitis \nSelect and explain. \nA. a, B. c, C. ac, D. bc', 'role': 'user'}, {'content': "Answer: D \nExplanation: Skin disorders causing nail pitting\xa0→\xa0Psoriasis, Alopecia areata, Reiter's syndrome, Lichen planus,Eczema, Incontinetia pigmenti", 'role': 'assistant'}]