In which root should the post be placed?

Correct answer: A. Distal (mandibular) / Palatal (maxillary)

• A. Correct. The distal root in mandibular molars and the palatal root in maxillary molars are typically the widest, straightest, and most accessible canals, making them ideal for post placement.
• B. Mesial roots in mandibular molars are often curved and narrower, making post placement riskier (perforation risk).
• C. The mesiobuccal root/canal in maxillary molars is narrow and often curved, making it a poor choice for post placement compared to the palatal root.

Note: For mandibular molars: distal root. For maxillary molars: palatal root (widest, most accessible).