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
Teratoma is best describad as: 
Select and explain. 
A. Hamartous developmental manifestation consisting of three different layers, B. Occurs most commonly in stomach and lungs, C. Originates from mesodermal tissue, D. Associated with very painful condition
A: Hamartous developmental manifestation consisting of three different layers
Answer: A: Hamartous developmental manifestation consisting of three different layers 
Explanation: None