Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'pectoral fin ray 7'?

A. Pectoral fin lepidotrichium that, in a linear sequence, is the fifth most anterior pectoral ray that it is usually branched and segmented.
B. Pectoral fin lepidotrichium that is not distally branched.
C. Pectoral fin lepidotrichium that, in a linear sequence, is the seventh most anterior pectoral ray that it is usually branched and segmented.
D. Pectoral fin lepidotrichium that, in a linear sequence, is the sixth most anterior pectoral ray that it is usually branched and segmented.

Answer: Pectoral fin lepidotrichium that, in a linear sequence, is the seventh most anterior pectoral ray that it is usually branched and segmented.