Google Sheets Text Text
=index(D4:L4; match(max(countif(D4:L4; D4:L4)); countif(D4:L4; D4:L4); 0))
Careful Cassowary
=index(D4:L4; match(max(countif(D4:L4; D4:L4)); countif(D4:L4; D4:L4); 0))