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<think>
Okay, I need to classify this bug report: "Cannot use usb-host on Mac OS". Let's see.
First, looking at the options: device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor, and others like mistranslation or assembly.
The issue is about USB host not working on macOS. USB-host relates to hardware devices. In QEMU, the USB host device emulation would be part of device handling. So it's under 'device' category.
Wait, but another thought: sometimes USB issues can be related to peripherals more specifically. But since 'device' is a broader category that includes all types of hardware devices, including USB, I think 'device' is correct.
</think>
The bug report deals with the inability to use USB host functionality on macOS, which falls under device handling in QEMU.
**Step-by-Step Explanation:**
1. **Identify Keywords:** The main issue is about "usb-host" and its failure on Mac OS.
2. **Understand Context:** In QEMU, usb-host relates to emulating a USB host for devices.
3. **Categorize Issue:** This falls under device-related problems as it's about hardware emulation.
**Answer:**
device
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