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
Prolonged calcium hydroxide therapy for root resorption causes risk of: 
Select and explain. 
A. Cervical root fracture., B. Apical third fracture., C. Middle third fracture., D. None of the above.
A: Cervical root fracture.
Answer: A: Cervical root fracture. 
Explanation: Cervical root resorption is the best answer among the option but if in options vertical root fracture is given then go for vertical root fracture.