request to choose a right UK visa type

[Anijan]

"I am traveling to London solely for tourism purposes. However, my sister is a student in London with a student visa that will expire in August. I am planning to travel there before the expiration date and take the opportunity to explore London with her. However, I will be staying in a hotel rather than with her (as she lives on campus), and I will be traveling without any invitation, covering all my expenses myself.
Given this information, which visa subtype should I choose in the application form?

"What is the main reason for your holiday visit to the UK?"

Tourism
Visiting family"

[Frontier Mole]

The best answer is the truth so put tourism and visiting family.