UVA Admissions - Letters of Recommendations from "Core Academic" Teacher

On UVA’s admissions deadlines and instructions page on, “recommendations from one counselor and one core academic teacher” are required. Counselor recommendation is obvious enough but what is exactly defined as “core academic”?

A teacher who taught you a core subject: math, english, social studies, science, or world language.

Alright. Thanks. I wasn’t sure because on Dean J’s blog, she states that they “require one teacher recommendation here, but we don’t specify the grade level or subject area for that teacher”. Could be outdated information though as the blog is from 2015. (link for those wondering: http://uvaapplication.blogspot.com/2015/10/recommendation-letters-for-uva.html)