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': 'Main drawback of esthetic fibre reinforced post over metallic post? \nSelect and explain. \nA. Technique sensitive and expensive, B. Bonding to dentin, C. Modulous of elasticity near to dentin, D. Not esthetic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]