Step 1: Understanding the key terms:
Trichology: Study of hair and scalp.
Saloononics: No such scientific study.
Cosmetology: Study and application of beauty treatments.
Pogonology: Study of beards.
Step 2: Conclusion: Thus, the correct answer for the study of beards is Pogonology.
Which of the following is an octal number equal to decimal number \((896)_{10}\)?