<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: The widest transverse diameter of the fetal skull is
Options:
A. Biparietal diameter
B. Occipito-frontal diameter
C. Bitemporal diameter
D. Suboccipito-frontal diameter
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is A: Biparietal diameter. Explanation: Transverse diameters of fetal skull are

Biparietal diameter: 9.5cm
Super-subparietal: 8.5cm
Bitemporal: 8cm
Bimastoid: 7.5cm<|im_end|>
