Another mistake on 2009 test?

[pistolpete007]

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A normal 10 1/2 year old child has
A. erupted both mandbiular first and second molars
B. completed root formation for the mandibular molar ONLY
C. completed enamel formation for all 3 mandibular molars
D. initiated calcification for the mandibular molars.

The answer is B but i think it should be D, according to kaplan
"first evidence of calcification for 1M is (8 mo pren.) 2M is (2 1/2-3) and third is 8-10yr

I dont think B is right answer bc although there is a completed root formaion for the mandibular first molar it is not the only tho....bc Mandibular Central incisor should have completed root formation as well

SOMEONE PLEASE HELP WITH THIS

 

[ibeflossin]

A normal 10 1/2 year old child has
A. erupted both mandbiular first and second molars
B. completed root formation for the mandibular molar ONLY
C. completed enamel formation for all 3 mandibular molars
D. initiated calcification for the mandibular molars.

The answer is B but i think it should be D, according to kaplan
"first evidence of calcification for 1M is (8 mo pren.) 2M is (2 1/2-3) and third is 8-10yr

I dont think B is right answer bc although there is a completed root formaion for the mandibular first molar it is not the only tho....bc Mandibular Central incisor should have completed root formation as well

SOMEONE PLEASE HELP WITH THIS

the correct answer is B as you mentioned. D is incorrect because a normal 10.5 year old child has not INITIATED calcification of the molars at this time (your timeline above is correct). however, the question is asking what is going on @ that age which is root completion of the first molars.

 

[Sarna]

I think B is not correct. Formation of the root is completed not only in mandibular molar but also in maxillary.
D seems correct as a child of that age would have the process of calcification already initiated around birth.

 

[rakhi]

Even i think the answer should be D,not B

Could anyone make this clear please?
Thanks