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
Macula cerulea is seen in – a) Pediculosis humanis corporisb) Pediculosis capitisc) Pthiris pubisd) Lupus erythematosis 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: Maculae ceruleae (blue - gray macules) occur in pediculosis corporis & P. pubis.