Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Can these holds be mounted to a concrete wall?
Document: Very happy, feel solid and authentic .. built a climbing wall for my little boy. He is thrilled it !
The item is priced appropriately. These are perfect for beginners or for a kid's rock wall; easy to grip and to install. Loved the product!
I bought these to use on a climbing wall for an obstacle course race, I was a little worried that they would be too hard for kids, but they were perfect for everyone from 5 to 65.
These work perfect for my climbing wall. Screwed them right into the solid wood. They smelled a bit like resin right out of the box. But that didn't effect the climbing and after a week the smell was gone.
Very nice holds. They don't have any texture on them like most holds so they kind of have a more natural feel.
We bought these for our four boys to attached to studs in the basement and they are perfect. The material looks and feels like real rock and the holds are perfect for kids hands. Thank you for a great product!
these are nice, smooth holds.Other thoughtsWe're very impressed with these holds. They really feel like real rock, down to their weight and minute details. I suspect these were cast from real stones, then climbing-appropriate edges, crimps and such were formed in the cast, and then they were re-molded. The end result is downright pretty (if you like rocks, as I do), and I catch myself marveling that these are actually composite products, rather than actual stones.
These look and feel very much like real rock. I hung them at a slight slope, mixed in with a few even larger "jugs" and my two year old can make good use of them--including some of the foot jibs.We really appreciated the variety of holds (in our case no two were alike). Each hold offers at least one mounting option that achieves a deep 3+ finger grip for an adult.
I did notice my two year old managing a few double grips. A few of the foot jibs, while of course not as large, had a lip option that still offered a reasonable hand hold.Each rock offers a variety of mounting choices. I chose the easiest in each case but noticed that there were often narrower and/or slopier choices. The right spacing / mounting angle could be used to achieve several levels of difficulty and some interesting challenges with the same holds.We are very satisfied with these.
They came quickly and are very solid. They look, and feel, like actual stone. I'll be installing them later this week on 3/4 plywood.
Answer: yes