885-17-19(have read the discussion)

        Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone not normally found in the organ in which the tumor appears.

(A) because they are composed of tissues such as tooth and bone

(B) because they are composed of tissues like tooth and bone that are

(C) because they are composed of tissues, like tooth and bone, tissues

(D) in that their composition, tissues such as tooth and bone, is（E）

(E) in that they are composed of tissues such as tooth and bone, tissues

I think the answer is wrong , because OG said "in that "is <"because", I think A is correct ,please help!!!!

The original meaning says that the tissues are not normally found in the organ.

But A says that the tooth and bone are not normally found in the organ, so the meaning is confusing. Hence A is wrong.

But what is the most important thing to us ? OG said "in that" is out of use now , the best way to relate such a sentence is using "because"!!

(by the way thank mbz very much for answering me a lot of questions )

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