Two car garages have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. Devise a circuit that resembles this situation using diodes.

(N/A) In this scenario,the gate needs to open if input $A$ is high $OR$ input $B$ is high. This logic corresponds to an $OR$ gate. $A$ diode-based $OR$ gate circuit is used here,where the cathodes of two diodes are connected together to the output $C$,and the anodes serve as inputs $A$ and $B$. When either input $A$ or $B$ is at a high potential (logic $1$),the corresponding diode becomes forward-biased,allowing current to flow and raising the potential at output $C$ to a high state (logic $1$). If both are high,the output remains high. If both are low (logic $0$),the output is low.
Truth table for $OR$ gate:

Inputs $(A, B)$	Output $(C)$
$0, 0$	$0$
$0, 1$	$1$
$1, 0$	$1$
$1, 1$	$1$