Which of the following language Al-Biruni did not know?

The correct answer is Option (4) → Greek

Al-Biruni was born in 973 , in Khwarizm in presentday Uzbekistan. Khwarizm was an important centre of learning, and Al-Biruni received the best education available at the time. He was well versed in several languages: Syriac, Arabic, Persian, Hebrew and Sanskrit. Although he did not know Greek, he was familiar with the works of Plato and other Greek philosophers, having read them in Arabic translations.