A, B, C, D and E are five members of a family. In this family there is a doctor, a teacher, a professor, a inspector and a businessman. A is the son of a professor. D is an unmarried lady. In the family there is a married couple in which B is inspector and husband of the professor. E is the brother of C and he is neither a teacher nor a businessman. Son of the married couple is not the teacher. There is no lady doctor in the family. The teacher is not married. Who is the teacher?

Option 2 : D

The logic follows here is:

[ alt="Common Diagram 28.01.2020 D3" src="https://storage.googleapis.com/tb-img/production/20/08/Common_Diagram_28.01.2020_D3.png" style="width: 208px; height: 280px;">

1). A is the son of a professor.

[ alt="F1 Chitranshi 2.7.21 Pallavi D3" src="//storage.googleapis.com/tb-img/production/21/07/F1_Chitranshi_2.7.21_Pallavi_D3.png" style="width: 81px; height: 83px;">

2). B is an inspector and the husband of the professor.

[ alt="F1 Chitranshi 2.7.21 Pallavi D4" src="//storage.googleapis.com/tb-img/production/21/07/F1_Chitranshi_2.7.21_Pallavi_D4.png" style="width: 230px; height: 122px;">

3). E is the brother of C and E is neither a businessman nor a teacher. (Therefore, E is a Doctor).

[ alt="F1 Chitranshi 2.7.21 Pallavi D5" src="//storage.googleapis.com/tb-img/production/21/07/F1_Chitranshi_2.7.21_Pallavi_D5.png" style="width: 344px; height: 129px;">

6). The teacher is not married and D is not married. Therefore, D is a Teacher.

7). The remaining A is a businessman.

After combining all the statements, we have the least possible family tree diagram as follows:

[ alt="F1 Chitranshi 2.7.21 Pallavi D6" src="//storage.googleapis.com/tb-img/production/21/07/F1_Chitranshi_2.7.21_Pallavi_D6.png" style="width: 372px; height: 144px;">

So, D is the teacher.

Hence, "D" is the correct answer.