When comparing sex from skeletal remains, the MOST reliable single skeletal feature for biological sex determination in an adult is:
- A Pelvic inlet shape and dimensions (pelvimetry) ✓
- B Mastoid process size
- C Supraorbital ridge prominence
- D Mandibular symphysis height
Correct answer: A. Pelvic inlet shape and dimensions (pelvimetry)
Explanation
The pelvis provides the most reliable sex determination in adults (~95% accuracy) because it is shaped by functional demands of bipedalism in males and obstetric requirements in females. Key discriminators include the subpubic angle (>90° female, <90° male), sciatic notch width (wider in females), pelvic inlet shape (gynecoid vs. android), and ischiopubic ramus form. Cranial features (mastoid process, supraorbital ridge) are useful (~80% accuracy) but less reliable than pelvic morphology. Mandibular height is a less discriminating feature.
Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.