NBDE questions need help

[NYtimes]

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Hey guys would you please let me know correct answers of any of the following questions that you know;

which of the following represents primary function of sIgA?

• aggregates microorganisms and prevents colonization
• activates complement in secretory fluids
• .....

I think the correct answer is one of these choices. but not sure which..
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when post. teeth contact more heavily than ant. teeth in closure and ant. disclude post. in eccentric, the condition is:

• cr-co discrepancy
• mutually protected
• group function

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which groove on mand 2nd molar does Not have counter part on mand 1st molar?

• DF tisnhulst
• DL
• DL triangular

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which tooth has most convex and steepest buccal aspect?

• max canine
• max premolar
• mand 1sth premolar

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in maximal opening, condyles are positioned :

• in anterior glenoid fossa
• just post to articular tubercle
• either inferior or anterior to articular tubercle I think this is answer right?

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most common anomaly of max canine?
lingual tuberle ---> i think this is correct
root bifurcation
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which factor most influences lingual concavity of maxillary ant. teeth and groove direction of post. teeth?
ant guidance
angle of eminence
curve of occlusion
bennett movement
direction of movement of rotationg condyle
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predominant serum immunoglobulin during memory response?

Ig G??? right?

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