**Question:** Bevelling of skull is seen in: March 2013 (e.g.)

**Core Concept:** Bevelling of skull refers to the process of bone remodeling and reshaping, which is essential for maintaining the skull's shape, strength, and function. This process is regulated by various factors, including mechanical stress, hormones, and growth factors.

**Why the Correct Answer is Right:** March 2013 (e.g.) is a reference to the specific example of bevelling during fetal development. Bevelling occurs to accommodate the growing brain and minimize the skull's volume while maintaining structural integrity. It is a crucial aspect of craniosynostosis prevention, which is the premature fusion of skull sutures leading to abnormal skull shape and increased intracranial pressure.

**Why Each Wrong Option is Incorrect:**

A. This option refers to the bevelling process in adults, which is essential for maintaining skull shape and strength but not limited to March 2013.
B. This option mentions "placental hormones" as the cause of bevelling, but the primary regulators are mechanical stress and growth factors, not hormones specifically related to pregnancy.
C. This option refers to the bevelling in a specific date, which is irrelevant to the actual process.
D. This option discusses the bevelling of skull in relation to a specific condition (craniosynostosis), which is an unrelated condition to the process of bevelling itself.

**Clinical Pearl:** Bevelling of skull is a fundamental physiological process that occurs throughout life, ensuring proper skull shape, size, and strength. It is regulated by mechanical stress, growth factors, and a complex interplay between them. This process is essential for maintaining optimal cranial structure and function, ensuring proper brain growth and protection.

**Correct Answer:** D. Bevelling of skull occurs throughout life to maintain skull shape, size, and strength. It is regulated by mechanical stress, growth factors, and a complex interplay between them. This process is essential for maintaining optimal cranial structure and function, ensuring proper brain growth and protection.