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: Pathology
A patient comes with emotional problems, 
increased salivation; pallor of oral mucosa and a
grayish blue discoloration of the gingiva. These 'findings are most consistent with a clinical impression of: 
Select and explain. 
A. Cherubism, B. Cretinism, C. Pierre Robin syndrome, D. Lead poisoning
D: Lead poisoning
Answer: D: Lead poisoning 
Explanation: None