Task: Question Answering
Input (English): If lines \(\overline { BC } \) and \(\overline { BD } \) are each perpendicular to line \(\overline { AB } \), which of the following must be true?
(A)\(\overline { AB } \perp \overline { CD } \) (B)\(\overline { AB } \perp \overline { AC } \) (C)\(\overline { AC } \perp \overline { AD } \) (D)\(\overline { AB } \parallel \overline { CD } \) (E)\(\overline { BC } \perp \overline { BD } \)
Output (English): A