This document describes which segments of a 7-segment display must be lit to display the digit '5' given a BCD input of '0101'.
BCD Input: The BCD input '0101' represents the decimal number 5.
Segment Requirements: We need to determine which segments (a, b, c, d, e, f, g) of a 7-segment display must be lit (value 1) to display the digit '5'.
The standard display for '5' lights up segments: a, f, g, c, d. Segments b and e are off.
So, the pattern for 'abcdefg' is 1011011.
Conclusion: \(\boxed{1011011}\)