Question: Were Greeks essential to crafting Egyptian Lighthouse of Alexandria?, Answer:Yes, Description of Lighthouse of Alexandria: Ancient lighthouse in Egypt, Fact1: The Lighthouse of Alexandria was an impressive monument in Egypt., Fact2: The Lighthouse of Alexandria was built by pharaoh Ptolemy II., Fact3: Ptolemy II was the son of Ptolemy I Soter., Fact4: Ptolemy I Soter was a Greek bodyguard of Alexander the Great and became pharaoh of Egypt.
Step1: Who built the Lighthouse of Alexandria?, Step2: Who was #1's father?, Step3: Was #2 Greek?, Wikipedia page for step 1: Lighthouse of Alexandria, Wikipedia page for step 2: Ptolemy II, Wikipedia page for step 3: Ptolemy I Soter, not_definitive_answer: False, incorrect_answer: False