What is the relationship of the long axis of the foetus to the long axis of the maternal spine?

Correct option is B

The term "lie" refers to the relationship between the long axis of the fetus and the long axis of the mother's spine. It can be longitudinal (most common), transverse, or oblique. This classification is critical for assessing fetal position and planning for delivery. A longitudinal lie is normal for vaginal delivery, while transverse or oblique may require medical intervention.
Explanation of options: (a) Presentation – This refers to the part of the fetus that is positioned to come out first, such as cephalic (head-first) or breech (buttocks or feet). It is not about axis alignment. (b) Lie – This is the correct answer. "Lie" defines the alignment of the fetus’s body relative to the mother’s. A longitudinal lie indicates parallel alignment, suitable for normal delivery. (c) Denominator – This is a bony point on the presenting part of the fetus used to describe fetal position, like the occiput in a vertex presentation, not axis orientation. (d) Attitude – Attitude describes the degree of flexion or extension of fetal joints, particularly the head, not the relationship between fetal and maternal axes.