Are Saturn's famous rings solid?
The rings are made mostly of dust and particles. The ring matter is constantly in orbital motion around Saturn.
The answer is no.

Was dynamite used during Middle Ages warfare?
The Middle Ages ended with the Fall of Constantinople in 1453. Dynamite was invented by Swedish chemist Alfred Nobel in the 1870s.
The answer is no.

Can cancer cause excess adrenaline production?
Adrenaline is produced by the adrenal glands. Cancer is a disease characterized by the formation of tumors. Tumors on the adrenal glands can cause them to over-express.
The answer is yes.

Can a minotaur hypothetically injure a tibia playing football?

A minotaur is a mythological creature with the head of a bull and the body of a human. The tibia is the bone between the knee and the ankle in humans. Tibia injuries are common injuries in contact sports such as football.
The answer is yes.