A is the brother of B, C is the daughter of B, D is the husband of B and E is the daughter of A. What is the relationship between C and D?

Introduction / Context:
This problem focuses on a single relationship inside a small family where several relations are given. You are asked to determine how two particular people, C and D, are related to each other. This is a very typical format for blood relation questions in verbal reasoning exams.

Given Data / Assumptions:

• A is the brother of B, so A and B are siblings and A is male.
• C is the daughter of B, so B is a parent and C is a female child of B.
• D is the husband of B, so D is male and married to B.
• E is the daughter of A, which is extra information not needed for the relation between C and D.
• We assume a straightforward nuclear family with B married to D and no hidden complications.

Concept / Approach:
Once we know that C is the daughter of B and D is the husband of B, we can infer that D is also the father of C, because both parents of a child are normally the married couple described. The question specifically asks for the pair relation "between C and D", so we phrase the answer as father and daughter.

Step-by-Step Solution:
Step 1: From "C is the daughter of B", we know C is a female child and B is a parent.Step 2: From "D is the husband of B", we know D is the male spouse of B.Step 3: In a typical family diagram, B and D form the parent couple, and C, as the daughter of B, is also the daughter of D unless something different is mentioned.Step 4: Therefore D is the father of C, and C is the daughter of D.Step 5: The required relation between C and D is father and daughter.

Verification / Alternative check:
You can visualise this with simple names. Let B be named Meera, D be her husband Raj and C be their daughter Nisha. The statements become: A is Meera brother, Nisha is the daughter of Meera and Raj is the husband of Meera. Clearly, Nisha is the daughter of Raj, and Raj is the father of Nisha. That exactly matches father and daughter.

Why Other Options Are Wrong:
Mother and son would require C to be a male child and D to be female, both of which are opposite to what is given. Mother and daughter would place D as mother, but D is described as a husband, hence male. Father and son would require C to be male, but the problem says C is a daughter. Brother and sister cannot be used because the age and generation gap between C and D is that of parent and child, not siblings.

Common Pitfalls:
Sometimes candidates get distracted by the extra information about A and E, even though that information is not needed to answer the question. In family puzzles, first determine which pieces of data are actually relevant to the relation being asked. Also, always pay attention to words like daughter and husband that fix both the generation and the gender of the persons involved.

Final Answer:
C and D have a father and daughter relationship, with D as the father and C as the daughter.