With no explanation, chose the best option from "A", "B", "C" or "D". that is so related structurally to another substance as to be theoretically derivable from it even when not so obtainable in practice (the methoxy of naphthalene).” Webster’s Int’l 608. Thus, while some of the general purpose dictionaries provide support for Defendant’s suggested definition for derivative, others define the term as proposed by Plaintiffs. Technical dictionaries can also assist claim construction by showing how those skilled in the art define “derivatives.” Moba v. Diamond Automation, Inc., 325 F.3d 1306, 1315 (Fed.Cir.2003) (“[A]s this court has repeatedly counseled, the best indicator of claim meaning is its usage in context as understood by one of skill in the art at the time of invention.”); Dow Chem. Co. v. Sumitomo Chem. Co., 257 F.3d 1364, 1373 (Fed.Cir.2001) (<HOLDING>). Here, again, the cited sources provide

A: holding that courts may consult scientific dictionaries and technical treatises to deter mine the ordinary meaning of a technical term to persons skilled in the art
B: holding that the specifications reference to a selector sufficed as one skilled in the art would have understood the term
C: recognizing we must give insurance policy language its ordinary and generally accepted meaning unless the policy shows that the words used are intended to impart a technical or different meaning
D: holding that when a term is not defined in a contract the presumption is that the term is to be given its ordinary meaning and significance
A.