Which of the following is a detachment of the nail from the bed of the nail?

A) Beau's lines
B) Onycholysis
C) Yellow nail syndrome
D) Trichorrhexis nodosa

Onycholysis is a condition where there is a separation of the nail plate from the bed of the nail, resulting in white discoloration and potential for infection. Beau's lines are horizontal ridges on the nail, Yellow nail syndrome is characterized by thick, yellow nails, and Trichorrhexis nodosa is a hair condition where there are nodules or swelling along the hair shaft.