Complete analogous pair - Influenza : Virus : : Typhoid : ?

D. BACTERIA

At an Electronic Data Processing Unit, five out of the eight program sets P, Q, R, S, T, U, V and W are  to be operated daily. On any one day, except for the first day of a month, only three of the program sets must be the ones that were operated on the previous day. The program operating must also satisfy the following conditions :
(i). If program P is to be operated on a day, V cannot be operated on that day.
(ii). If Q is to be operated on a day, T must be one of the programs to be operated after Q.
(iii). If R is to be operated on a day, V must be one of the programs to be operated after R.
(iv). The last program to be operated on any day must be either S or U. If R is operated at third place in a sequence, which of the following cannot be the second program in that sequence ?

A + B means A is the daughter of B ;
A x B means A is the son of B  and
A - B means A is the wife of B.

If P x Q - S, which of the following is true ?

B. S IS FATHER OF P

Choose or find odd pair of words - (Whale : Mammal) , (Salamander : Insect) , (Snake : Reptile) , (Frog : Amphibian)

B. SALAMANDER : INSECT

Choose the correct alternative from the following : - Assertion (A) : A little gap is left between iron rails.
Reason (R) : Iron expands in summer.

A. BOTH A AND R ARE TRUE AND R IS THE CORRECT EXPLANATION OF A.