3. Commonly called lockjaw, is another illness caused by a bacterial toxin or poison from the spore of the bacterium Clostridium tetani. a. Tuberculosis b. Tetanus c. Aids d. None of the Above 4. For every increase in 5dB, the duration of exposure should be reduced by a. Half b. Quarter c. One d. All of the above 5. Type of noise-induced hearing loss where hearing recovery occurs after 24-48 hours. a. Temporary Threshold Shift b. Permanent Threshold Shift c. Hearing Impairment d. None of the above