Choose from options: Determine if the sentence is true based on the text below:
Orthrus was killed by his brother Cerberus. 

In Greek mythology, Orthrus (Greek: Ὄρθρος , "Orthros") or Orthus (Greek: Ὄρθος , "Orthos") was, according to the mythographer Apollodorus, a two-headed dog who guarded Geryon's cattle and was killed by Heracles. He was the offspring of the monsters Echidna and Typhon, and the brother of Cerberus, who was also a multi-headed guard dog.
Available choices:
 - Yes.
 - It's impossible to say.
 - No.
No