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
Post is not required in all of the following conditions except: 
Select and explain. 
A. If adequate retention of core can be achieved by natural undercuts of crown, B. If there are horizontal cracks in the coronal portion of the teeth, C. When tooth is subjected to excursive occlusal stresses, that is, when there is presence of lateral stresses of bruxism or heavy incisal guidance, D. None
D: None
Answer: D: None 
Explanation: Conditions where post should not be given:

Any sign of endodontic failures are evident, i.e. tooth exhibits:
	
Poor apical seal and poor quality obturation
Active inflammation
Presence of fistula or sinus
Tender on percussion


If adequate retention of core can be achieved by natural undercuts of crown.
If there are horizontal cracks in the coronal portion of the teeth.
When tooth is subjected to excursive occlusal stresses, that is, when there is presence of lateral stresses of bruxism or heavy incisal guidance.