With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Anorexia nervosa is characterized by low weight in men.
text_B: The Motorola C390 is a low-cost 900 / 1800 / 1900-band GSM mobile phone , manufactured by Motorola .. GSM. GSM. mobile phone. mobile phone. Motorola. Motorola. It was released in the fourth quarter of 2004 as a successor to the C385 .. Main difference is the availability of bluetooth with the C390 .. Dimensions are 107 x 44 x 20.9 mm , weight is 91 g .. It was available in Dark Blue Green Soft Feel and Dark Roast Black .
not_related.