question:  Why did Callahan think Trillium was Berta when he first spotted her?
context: [Transcriber's Note: This etext was produced from Planet Stories Summer 1955. At the first flash of red on the bank of meters Apprentice Burnerman O'Rielly had slammed the safety helmet on his head; he was already throwing open the lock to the burner room. A dozen burners on this ship; why did something crazy have to happen to O'Rielly's? Not enough to cause serious trouble this far out from Earth. Sweat pouring off him, O'Rielly prowled around his burner. Ever since Venus blast-off O'Rielly had been in Four's watch room. Well, ma'am, O'Rielly searched every cranny where even a three-tailed mouse of Venus could have stowed away. His first flight, and O'Rielly saw himself washed out, busted to sweeper on the blast-off stands of some God-forsaken satellite. Oh, she was a female human, though, this creature at which O'Rielly stood gaping. This, mind you, he felt in an age where no Earth guy for a thousand years had dared raise so much as a breath against woman's supremacy in all matters. That male character trait, however, did not seem to be the overpowering reason why O'Rielly, instead of laying violent hands upon this one's person, heard himself saying in sympathetic outrage, "A shame you had to go to all that bother to get out here!" "Higher than a swacked skunk's tail again," Callahan muttered, then snapped back over his shoulder, "Use your shower!" Somehow he doubted that Burner Chief Terrence Callahan's mood, or Captain Millicent Hatwoody's, would be improved by knowledge of she who was in O'Rielly's shower now. It was in OFF position; the flight room full of fancy gold-lace petticoats could not have overheard from here. "Thousand years ago, it was, the first flight reached Venus. "No Venus dames allowed within fifty miles of their port. Any dame caught trying to leave Venus thrown to the tigers for supper.
output:  Because Berta was Trillium's Grandmamma and she resembled her from a hundred and twenty-five years ago.
options:  Because Berta was Trillium's Grandmamma and she resembled her from a hundred and twenty-five years ago.  Because she introduced herself as so and led him to believe that was who she was.  Because all the Venus women have the same enchanting appearance.  Because only Berta was able to enter the ship.