The commonest presentation of fetus at the onset of labor is:

Correct option is D

Ans. (d) Vertex presentation
Sol. Vertex presentation is the most common presentation of the fetus during labor, where the head (particularly the occiput) is the presenting part.
Explanation of each option:
· (a) Podalic presentation – Breech (feet or buttocks first), uncommon.
· (b) Shoulder presentation – Transverse lie, rare.
· (c) Face presentation – Head extended, rare presentation.
· (d) Vertex presentation – Correct. Most common and ideal for normal delivery.