Instructions: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Input: [header] How to diagnose respiratory problems in rabbits [title] Look for nasal discharge. [step] The most common respiratory problem is' snuffles ,' a disease that causes upper respiratory tract infections with a nasal discharge. The classic pasteurella infection discharge is a thick, creamy white discharge from the nostrils. <sep> (A) When cut off, the mucus and blood will evaporate out from the nose. If your rabbit's nose discharge feels light, pale pink, tender to the touch, or has a yellowish pallor, it is very likely fungus. (B) The discharge from the nose is yellow or reddish in color. It does not appear bloody, warm to the touch, or foul smelling. (C) [substeps] Your rabbit may wipe away this discharge with a cotton ball. If this mucus secrets from the nose, get it tested. (D) However the discharge can be anything from watery to white to yellow. [substeps] Pasteurella is so commonly a cause of ill health because many rabbits have it in their respiratory tract as a normal inhabitant.
Output:
D