Please some help with this question

[omarpaste]

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The contact area that is most nearly circular is located on the crown of which of the following maxillary premolars?

A. Mesial of the first
B. distal of the first
c. Mesial of the second
D. Distal of the second

 

[utahdentist2be]

I'm not 100% sure, but I would say the distal of the 2nd premolar because of it's ovoid occlusal outine. The mesial side often has a slight concavity, whereas the distal has a rounded surface. Someone feel free to correct me if I'm wrong.