Vertical alignment in beamer presentation generated with R markdown - vertical-alignment

Question

When I use R Markdown to create slides for a beamer presentation, the text is vertically centered, which really looks odd if you only want to use 1-2 lines a slide. Is there anyway to align the text to the top of the slide (under the slide caption)?
Looking for answer, I found this post and tried to use it in R Markdown, but nothing I tried worked.
You can change the horizontal text alignment and font size for instance by using these commands
\begin{flushright}
\begin{tiny}
bla..
\end{tiny}
\end{flushright}
is there something similar for vertical text alignment? So far I've tried this:
Attempt 1:
---
title: "Untitled"
author: "Author"
date: "25 Januar 2017"
output: beamer_presentation
---
\documentclass[t]{beamer}
## Caption 1
test
Attempt 2:
---
title: "Untitled"
author: "Author"
date: "25 Januar 2017"
output: beamer_presentation
---
## Caption 1
\begin{frame}[t]
test
\end{frame}
Attempt 3:
---
title: "Untitled"
author: "Author"
date: "25 Januar 2017"
output: beamer_presentation
---
## Caption 1
\begin{flushleft}[t]
test
\end{flushleft}

Answer 1

Include classoption: t with the title, author, etc. For example:
title: "Title"
author: "Author"
date: "Date"
output: beamer_presentation
classoption: t