If one of your feet is in a leg cast, should the other be in a sandal?
Rationale first then the answer.
If you are using crutches, it is advised to have non-slip shoes with a closed toe. Most sandals do not have non-slip traction and, by definition, don't have closed toes. If you are in a leg cast you are likely to be using crutches.. The answer is: no.

Is an astronomer interested in drosophila?
Rationale first then the answer.
Astronomers study celestial bodies like planets and stars. Drosophila are a type of fly commonly studied by scientists in fields related to biology.. The answer is: no.

Did origin dynasty of Go precede Jia Sidao?
Rationale first then the answer.
Go is a strategy game that originated in the Zhou dynasty. The Zhou dynasty lasted from 1046 BC 256 BC. Jia Sidao was a chancellor during the late Song dynasty. The Song dynasty started in 960 AD and lasted until 1279 AD.. The answer is: yes.